It was probably happening 'off-screen'.

Rowling has stated that she intended her characters to grow up, get hormones and have "sexual feelings". However, she didn't want to make the books overly coarse by including sex within the story itself.

The characters in Enid Blyton's Famous Five books act in a prepubescent way right through the series. In the Narnia books the children are never allowed to grow up, even though they are growing older.

 

I want Harry Potter and his friends to grow up as well as older, though I'll keep it all humorous, well within the tone of the books. I want them eventually to be truly 17 and discover girlfriends and boyfriends and have sexual feelings - nothing too gritty. Why not allow them to have those feelings?
_{(Sydney Morning Herald interview, 28th October 2001).}

It's a fair bet that sex was happening off-screen, but that Rowling didn't want to depict it. As such, we get the hints and suggestions that others have alluded to; for example:

Snape had his wand out, and was blasting rose bushes apart, his expression most ill-natured. Squeals issued from many of the bushes, and dark shapes emerged from them.
"Ten points from Hufflepuff, Fawcett!" Snape snarled, as a girl ran past him. "And ten points from Ravenclaw, too, Stebbins!" as a boy went rushing after her.
_{(Goblet of Fire, Chapter 23, The Yule Ball).}

This sort of slight of hand/innuendo also occurs in the movies - for instance when students seemingly recreate the car sex scene in Titanic in this deleted scene.

Rowling clearly thinks that her students have a sex drive. They have hormones and desires, in keeping with Rowling's intention to create rounded, realistic characters, not sterilized robots which remain children forever. As others have said suggested, the fact that the books were targeted at children meant that everything was kept in good taste and mostly left to the (older) readers' imaginations. That doesn't mean that sex wasn't happening at all.

It was probably happening 'off-screen'.

Rowling has stated that she intended her characters to grow up, get hormones and have "sexual feelings". However, she didn't want to make the books overly coarse by including sex within the story itself.

The characters in Enid Blyton's Famous Five books act in a prepubescent way right through the series. In the Narnia books the children are never allowed to grow up, even though they are growing older.

I want Harry Potter and his friends to grow up as well as older, though I'll keep it all humorous, well within the tone of the books. I want them eventually to be truly 17 and discover girlfriends and boyfriends and have sexual feelings - nothing too gritty. Why not allow them to have those feelings?
_{(Sydney Morning Herald interview, 28th October 2001).}

It's a fair bet that sex was happening off-screen, but that Rowling didn't want to depict it. As such, we get the hints and suggestions that others have alluded to; for example:

Snape had his wand out, and was blasting rose bushes apart, his expression most ill-natured. Squeals issued from many of the bushes, and dark shapes emerged from them.
"Ten points from Hufflepuff, Fawcett!" Snape snarled, as a girl ran past him. "And ten points from Ravenclaw, too, Stebbins!" as a boy went rushing after her.
_{(Goblet of Fire, Chapter 23, The Yule Ball).}

This sort of slight of hand/innuendo also occurs in the movies - for instance when students seemingly recreate the car sex scene in Titanic in this deleted scene.

Rowling clearly thinks that her students have a sex drive. They have hormones and desires, in keeping with Rowling's intention to create rounded, realistic characters, not sterilized robots which remain children forever. As others have said suggested, the fact that the books were targeted at children meant that everything was kept in good taste and mostly left to the (older) readers' imaginations. That doesn't mean that sex wasn't happening at all.

It was probably happening 'off-screen'.

Rowling has stated that she intended her characters to grow up, get hormones and have "sexual feelings". However, she didn't want to make the books overly coarse by including sex within the story itself.

The characters in Enid Blyton's Famous Five books act in a prepubescent way right through the series. In the Narnia books the children are never allowed to grow up, even though they are growing older.

I want Harry Potter and his friends to grow up as well as older, though I'll keep it all humorous, well within the tone of the books. I want them eventually to be truly 17 and discover girlfriends and boyfriends and have sexual feelings - nothing too gritty. Why not allow them to have those feelings?
_{(Sydney Morning Herald interview, 28th October 2001).}

It's a fair bet that sex was happening off-screen, but that Rowling didn't want to depict it. As such, we get the hints and suggestions that others have alluded to; for example:

Snape had his wand out, and was blasting rose bushes apart, his expression most ill-natured. Squeals issued from many of the bushes, and dark shapes emerged from them.
"Ten points from Hufflepuff, Fawcett!" Snape snarled, as a girl ran past him. "And ten points from Ravenclaw, too, Stebbins!" as a boy went rushing after her.
_{(Goblet of Fire, Chapter 23, The Yule Ball).}

Rowling clearly thinks that her students have a sex drive. They have hormones and desires, in keeping with Rowling's intention to create rounded, realistic characters, not sterilized robots which remain children forever. As others have said suggested, the fact that the books were targeted at children meant that everything was kept in good taste and mostly left to the (older) readers' imaginations. That doesn't mean that sex wasn't happening at all.

It was probably happening 'off-screen'.

Rowling has stated that she intended her characters to grow up, get hormones and have "sexual feelings". However, she didn't want to make the books overly coarse by including sex within the story itself.

The characters in Enid Blyton's Famous Five books act in a prepubescent way right through the series. In the Narnia books the children are never allowed to grow up, even though they are growing older.

I want Harry Potter and his friends to grow up as well as older, though I'll keep it all humorous, well within the tone of the books. I want them eventually to be truly 17 and discover girlfriends and boyfriends and have sexual feelings - nothing too gritty. Why not allow them to have those feelings?
_{(Sydney Morning Herald interview, 28th October 2001).}

It's a fair bet that sex was happening off-screen, but that Rowling didn't want to depict it. As such, we get the hints and suggestions that others have alluded to; for example:

Snape had his wand out, and was blasting rose bushes apart, his expression most ill-natured. Squeals issued from many of the bushes, and dark shapes emerged from them.
"Ten points from Hufflepuff, Fawcett!" Snape snarled, as a girl ran past him. "And ten points from Ravenclaw, too, Stebbins!" as a boy went rushing after her.
_{(Goblet of Fire, Chapter 23, The Yule Ball).}

This sort of slight of hand/innuendo also occurs in the movies - for instance when students seemingly recreate the car sex scene in Titanic in this deleted scene.

Rowling clearly thinks that her students have a sex drive. They have hormones and desires, in keeping with Rowling's intention to create rounded, realistic characters, not sterilized robots which remain children forever. As others have said suggested, the fact that the books were targeted at children meant that everything was kept in good taste and mostly left to the (older) readers' imaginations. That doesn't mean that sex wasn't happening at all.