Birthday Sex

[JisthenewK]

So one of my friends, who is bisexual and in a relationship with a girl came onto me last night on Facebook. After my roast, he kept talking about a "present" he wanted to give me. I didn't really know what he meant at first, until he told me. He wants to have sex with me and apparently if it's just once, his girlfriend is okay with it! WHAT THE HELL???? At first I was excited, because he's cute and it was late when he told me, but now I'm freaked out. This is not the guy I like. This is really weird, but true. I don't want cheap sex with a FRIEND! Now that I realise it, I don't want my first to be with a close friend who was in a relationship, because I'm not a swinger or a whore. What do I do? :'(