Sex should not be viewed as an exchange of goods, whereby women give it as a "down payment" on a relationship and men receive it as a "thank you" for taking her out to dinner. And having sex on the first date shouldn't negatively impact your chances of a long-term relationship. But that's just not how things usually work. So the next time you're on a really great first date, and you're into each other, and you both want to have sex, there's no need to feel like you're breaking dating law. It's okay if you like someone or you're just plain old attracted to them, says Lola.