There's no strong evidence either way, but statistics suggest someone is getting lucky

Since we obviously have no in-canon proof of students having actual intercourse, we have to refer based on what we can:

1. Wizard children aren't fundamentally different from Muggle children when it comes to hormones. They fall in love, they get jealous, etc., etc.

2. They have access to magical items like love potions which, if anything, makes it more likely that they're adolescents who might experiment

3. Considering the number of similarities between Real World Britain and Rowling's fictional world, the fact that teenage sex is hardly a rarity in Great Britain would suggest that such trends probably follow suit at Hogwart's.

However, we should also remember:

1. Students of wizardy aren't like typical students. Learning magic can be dangerous and Hogwart's can be a tightly controlled environment because of this fact (and other reasons, like Voldemort's growing influence).

2. Towards the end of the series / books, the overall tone and culture of the school is closer to that of one during wartime. The possibility of getting blown up can be a bit of a dampener on romantic outings.

It's all a guess, but it seems likely that a) yes, someone is getting lucky however b) it might not as common as we might guess.

There's no strong evidence either way, but statistics suggest someone is getting lucky

Since we obviously have no in-canon proof of students having actual intercourse, we have to refer based on what we can:

1. Wizard children aren't fundamentally different from Muggle children when it comes to hormones. They fall in love, they get jealous, etc., etc.

2. They have access to magical items like love potions which, if anything, makes it more likely that they're adolescents who might experiment

3. Considering the number of similarities between Real World Britain and Rowling's fictional world, the fact that teenage sex is hardly a rarity in Great Britain would suggest that such trends probably follow suit at Hogwart's.

However, we should also remember:

1. Students of wizardy aren't like typical students. Learning magic can be dangerous and Hogwart's can be a tightly controlled environment because of this fact (and other reasons, like Voldemort's growing influence).

2. Towards the end of the series / books, the overall tone and culture of the school is closer to that of one during wartime. The possibility of getting blown up can be a bit of a dampener on romantic outings.

It's all a guess, but it seems likely that a) yes, someone is getting lucky however b) it might not as common as we might guess.