I get my shoulders waxed. It used to be by women (at generic chains like European Wax Center), but now I’ve found a cute gay guy to do it. Before I met my husband I used to have my hole waxed by a guy. I don’t do it anymore because my husband likes my fuzzy butt. I agree that it takes a lot of online searching to find a male manscaper, even in major cities.
If you’re just concerned about a woman seeing your boner, I’m sure it happens all the time. You might want to out yourself to her before the session so she knows your hard on is not about her, per se.