You don't... if you love her. Just ask her, if she doesn't want to, find another girlfriend because she is not truly bisexual in that case.
Push for a threesome of course!
iTHINKS SO BECAUSE I HAD A THreesome with him with a girl and im a boy :/ yum
suggest a threesome with another guy and see if he says yes, most men find threesomes with another guy disgusting unless they're gay
Let him have a threesome with your sister (only if hot)
have a threesome
Hooters?
No, she has a boyfriend
No dude she have a boyfriend
I don't have a boyfriend.
keep her away from him, knock her out. or if youre freaky, invite her in for the threesome. lol
That's kind of a tricky one. If I was you, I'd start by asking him "how would you like to have a threesome with me and...?" It's pretty simple. I've known one guy my entire life who was not up for a threesome with two women.