What are the possible reasons that makes a man restrain from having sex with a girl that he likes on a first date?

Well, I think this is obvious …

Because he doesn’t want to rape her.

I mean if this is all we have to go on, we have no way of knowing if the woman in question wants to have sex with him. So not raping people should be tops on his agenda.

I feel ridiculous for even having to say that, but a suspicious number of questions on Quora are the “How can I know as a man if a woman wants to have sex with me?” type. And the ethical answer is always something like “You look at the clues that she’s interested, ask to confirm your suspicions, then abide by her decision.”

So, really, the issue isn’t about timing so much as it is always about consent. If you have it and if you’re using barrier protection along with other forms of contraception, I don’t see a problem with everyone involved having sex on a first date.

Seriously, though, “restrain” is an unfortunate choice of words here. There is no compulsion to rape someone. There’s just an individual or individuals making the decision to commit assault. Be the kind of person that doesn’t pressure, manipulate, coerce, trick, or force someone you’re romantically/sexually interested in. Be the kind of person that’s honest, trustworthy, and ethical, no matter how horny you are.