I normally only go to Gay gyms that are attached to a bath house. So, for me it's no problem if I look or admire a hot guy, or vice-versa. In Gay gyms I'll look quite openly, but in a conventional gym, I'm more discreet.
I have been in conventional adult gyms that were segregated by gender, and I ended up getting cruised and, on every occasion but one, getting my cock sucked in the steam room. I didn't solicit it, but if I'm naked at the jacuzzi or in the locker room or shower, frankly I have a big, and nicely-shaped cock, and it gets attention. I'm no Adonis by ANY stretch, just an average guy with a nice face and fairly decent ass, but I have this big cock, and guys seem attracted.
One time I was at this gym in Northern Virginia where I used to go (a conventional, straight gym) and I was naked by the hot tub. I was lying on a chaise lounge after being in the water, and I was dozing-off a little bit. Well, like many men, when I sleep, my cock gets hard, or at least swells up a bit. I finally opened my eyes to see two other guys in lounges STARING at it, and when they saw my eyes open, they kind of looked away. I got up, went into the steam room, and less that 60 seconds later, one of them came in, sat down, and cruised me. I went over to him and shoved my cock into his mouth without a single word. A few minutes later, the second guy walked in, and joined us, and we had a hot 3-way.
So, even in straight gyms, cruising happens.