Seeing dick isn't a turn-off, but sometimes shriveled limp male equipment doesn't do much FOR me either.
Without getting too "clinical," it does seem like there's some low-level sexuality denial going on. I've hooked up with many a "curious" type, the kind who only want to j/o without your touching their unit
or only want to get head. One guy who I met up with several times wanted his tight squeaky-clean ass rimmed deep while his back was turned to me - nothing else.
More often than not they have no interest in seeing my stuff, and sometimes they even make it clear that they don't want to. Whatever works. I wanna do 'em, they wanna get done, they can check their baggage elsewhere.