sex with a girl ?

I had a dream i had sex with this girl . We and the girl friends and she is very gay but i still consider myself as straight lol. I had a dream i had sex with her and i told her and she said when i wanna fuck just let her know lmfaoo . But did i have the dream because i do wanna have sex with her or was this just a random dream and how do you have sex with a girl ? Like what you suppose to do with them ? 😂😂