I know its not exactly in the 'spirit' of the thread, but Id answer thus:
The two guys wernt fucking the girl 'for fun'... They were all being paid to do it, to create 'Content'
Now, if that content ends up on a straight site, then they are straight.
If the content ends up on a gay site... Then they are being gay
So is it gay? Depends where the content is used...
Would I do it personally?
Hell No... Thats shits fuckin' GAY !
