I read this on GirlsAskGuys.

Forced bi is when a girl forces her straight bf to suck another guy's cock. It's supposed to be very humiliating for him.

For me, the turn-on is the power. For most straight guys, their sexuality is set in stone, so it's super sexy when a guy submits to me so completely that he lets me bend his sexuality. It's like he has no identity, other than submitting to me - my sexual fantasy is more important than anything else, and he is willing to be humiliated and degraded to please me. It's a power trip.

What do straight guys think of this? (He has to be completely straight, otherwise it isn't as fun... if he is truly bisexual, then he secretly wanted it, and he isn't really submitting to me.)

I'm in complete agreement with the OP. If the sub is bisexual, the forced bi isn't humiliating or ego breaking, it's a reward!

Have you ever been humiliated by your Mistress with forced bi?

Do you fantasize about forced bi?
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Truth is everybody is going to hurt you: you just gotta find the ones worth suffering for.