Absolutely. I tried naked oil wrestling sometimes with guys who identified as straight, bi or gay.
I remember the first time I told a straight guy I'm probably going to get hard abd perhaps leak some pre cum hw said well nearly everyone does including me . So I didn't feel I had to worry about it. It is just natural and it's great to hear men of all sexualities feel so relaxed about it.
I've only done naked wrestling once or twice, but yes, I do easily get erections when wrestling. I remember one session with a friend around 20 years ago. We were out on a nude hike and encountered a large muddy puddle and decided to wrestle. Was a lot of fun and we both got erections.
An erection is a normal reaction of Male Body, in any kind of situation. Especially during physical activity. Should be normal and accepted, to get an erection anywhere in any situation. A Male should have the right to let a erection happened in every situation.