So for years we have seen that when a mature woman has sex with a boy (usually student/teacher) we see someone eventually say "but the boy can't get pregnant so it is different" or "the boy can't get a STI as easily as a girl" or other biological excuses for why it is different.

It just infuriates me when they do this because, what I usually so is say "So , if the man had a vasectomy , that makes it OK for him to have sex with that girl" or 'what if the male has had tests done and he is STI free, does that make it ok". This usually makes them move onto a new argument about power or some such thing.