Just so you know about feeling bad to go with another bloke for sex, you shouldn't!
It's only the Christian puritanism that made homosexuality/bisexuality something . To cut a long story short for the last 2000 years we are told to think it's evil while for ever since men are men bisexuality is in our habits.
I love women, I love their pussy juice and I love the texture inside their vagina, but that doesn't prevent me from enjoying sucking a man to completion, tasting his cum in my mouth or taking it up my arse.
To be very honest, it actually completes my life, with a woman I'm on the giving end, with a man, at the receiving end.
And last it, helped me understand how to properly give anal sex to my gf and that shooting sperm in the eye can be painful...
Many people mentioned it already, try it and learn from it, that can only be good experience for you.
Good luck