Jacking off with another man is only arousing to me if there is a pussy in the mix (I'm competing for the pussy). Otherwise, no.
I watch solo JO scenes at times, but it's just to "dick down" in my mind the dude jacking off (again - think "competition").
I get more bored with gay porn - rarely repulsed, unless it involves fisting, etc. I can watch it a little and get hard just because of the sexy male bodies and hyper sexual energy (who couldn't?); but, that said, I usually don't stay with it as I end up getting "bored stiff" (no pun intended).