I find it very erotic.
The idea of a girl pushing the blokes boundaries has always been a turn on for me.
not so far as being out right bi.
nothing makes me flaccid faster than bi porn.
but i love cozy mmfs were the guys are comfortable enough to let the girl lead them just out of their comfort zones.
Like rubbing their cocks together.
I saw a clip once where two guys were laying side by side, legs touching.
Both hand cuffed to the bed.
They were leaning inwards towards the girl and each other.
As the girl went from one to the other she would rest one guys cock on the other guys leg leaving wet patches were contact was made which she would eventually wipe off.
I like to see girls deliberately mix guys juices, making "rope bridges between their cocks.
I like watching a girl use one hand on one guy, then the same hand on the other.
Kissing one after sucking the other.
Giving one guy a handy, then getting the other to lick her hand before she starts on him.
That kind of thing.
But as soon as the guys touch each others cocks with their hands.
Or kiss each other.
I'm limp as a soggy biscuit..
weird eh?
If someone wants to post clips of this nature.
Feel very free to do so