You Get to Have Sex
If you have a sex on a first date, you’re having sex! Most of the time, that’s a good thing. In fact, if you actually don’t like your date but you both find each other hot, this might be the only time you get to have sex with that person. Do you really want to bother going on more dates with someone who you actually don’t like that much, but who you think is hot? Sure, if sex actually isn’t an option, it’s obviously not worth it to expend much effort trying to change that. But if you have the chance to give it a go, why not?