[naturegreen]

i) Meet up with different group of people, proceed only when you feel comfortable.
ii) Wear mask
iii) Go overseas for such sessions
since you want to remain anonymous.

Making holes in walls is not practical. Unable to see the female sucking on the guy is a torture to the mentality, so such restrictions can be considered a restraint.

PS: Most guys wouldn't want to have their brudder sucked by a gay.