It’s that hoary old question: Can you be still be friends after sleeping together? A stupid question. Of course you can and should be friends.
In my world, sleeping with someone is the quickest way to make a friend with a particularly deep level of intimacy. I don’t call it ‘Friends with Benefits’. The benefit IS the friendship. Let’s just call it what it is: ‘Sex with Friends’. And some of the best friendships I have are with people I’ve slept with.
Sex is an excellent way of making friends; and friendship is an excellent reason for sex.