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There are various ways to handle this, depending on how you want the scene to come across. Vague. That is to say, the reader knows they had sex by reasonable inferrence. You end one scene with the...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24347 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There are various ways to handle this, depending on how you want the scene to come across. **Vague**. That is to say, the reader knows they had sex by reasonable inferrence. You end one scene with them entering a 'private' area (bedroom, bathroom, remotre area of the woods, etc) and start the next scene with them being sweaty, touchy-feely, and much more physically and emotionally close to each other. In this way the more savvy will get it. **Euphemism based sex**. In this you have two options. You can just say what it is, just not in a clinical way. They didn't 'have sex' they 'made love' or 'screwed' or 'did the thing' or 'he popped her cherry' or whatever you want to describe it as. Or if you want a more direct approach, you can try the 'looking back sequence' this: "He isn't quite sure how things escalated, but he remembers the sensations, the warmth, the closeness. The nervous excitement is like a drug, even now." Be sure, if you take this route, you don't encourage your audience to 'do the deed', but show it in a real light (e.g. show repurcusions thereof: STI, pregnancy, risk of losing virginity to a jerk, insecurity afterwards, etc).