Before and After sex?

Hey y'all,

So I'm 16 going on 17 in about 4 months and I've gotten into a relationship with this boy who's 17 and who has had sex before. We have been talking for about 2 months and made it official recently. Him and I have had some "heated" moments (making out lol), but it never lead to sex. He respects me for wanting to wait until the right time, and I've come to the point where I want to have sex. I am a virgin and I know the basics of what to do (like having him wear a condom).

I should point out that I'm not on birth control and I understand the risks to having sex. I'm trying to get on bc beforehand so it lessens the risk.

I know you have to urinate after sex to lessen the chance of a UTI, what else should I know?

Before and after sex?