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Today, my husband is a pain. He thinks he might be bisexual, because we discovered he likes to have sex with a plug up his ass, and yet when I suggest a threesome or even if he experiments with a guy on his own, he gets this look like I want him to kiss a dead badger. I don’t know what he wants. FML
Others have already addressed the main issue, I'll address your problem. Being bisexual doesn't mean they'd be interested in threesomes or would be okay with hooking up with others while in a monogamous relationship.
Liking butt play does not make a man gay or even bi. The fact that he was repulsed is further evidence that he's strictly straight. Maybe ask him what he does want instead of making suggestions.
just tell your husband that about 80% of the human population enjoys butt play weather they will admit it or not lol plus the anus has just as many nerves as the genitals.