I’ve always said sex is a red herring. Rather than signify love, or a bonding experience, or a mutual commitment, or a stepping stone to a long-term relationship, the true significance of sex is only – and exactly – what the people having it decide it is. The real question is whether the people involved are truly on the same page in what it means to THEM.
So if you want to have sex on a first date – or any other time – do it. Just be honest with yourself and your partners while you’re doing it, and make sure they’re being honest with you.