Truth is, everyone is Bisexual, there's some who deny urges and attraction to the same sex. All I can say is to try it and expand your sexual horizons.
I'm Bi so I can confirm that in a majority of cases where I've had Bi threesomes with a couple, the guy often gives significantly better oral than his wife or girlfriend. And truthfully, I prefer to cum in the guy's mouth if I'm with an older (55+) couple. And I've also experienced some guys have tighter assholes than their wives.