I'm going to use my homosexual friend to get a PC.
Why does it matter that they're homosexual and how are they getting you a PC?
I'm going to start flirting with him and get him to think I'm interested. Then I'll hint about wanting a PC and I know he will get it for me.
You shouldn't use a friend's sexual orientation to get what you want. It sounds like what you're doing is manipulation and fraud. You could get caught and get into trouble.
But it's fun and we are both getting what we want. He gets to flirt with me and I get a PC.
Using someone for your personal gain is still not something that should be encouraged. Your friend may think you're not really they're friend.