This niche can get real hot.
Rob Fantana dabbles in this genre a little in a "fuck my wife" film I saw a few months ago. There were about 5 scenes, and in each one, he fucks the man's wife while the other dude looks on and then join in. The studs sometimes praise the dude with the biggest fucker and give him loads of verbal attention for being so well-hung. There is also lots of "make the man proud" talk with dick-to-dick rubbing over the woman's mouth during cum shots. Maybe not exactly what you like, but...it works for me.
Double vaginal is quite common nowadays in straight porn. Most studs do it.
Men putting a condom on anothe dude? Never seen that. I've never seen a man play with a woman's pussy while she is being fucked...well, sort of...but not in a proper way.