>>8005
Technically any manual sexual stimulation is masturbation, including if you give someone else a handjob, so yeah... it's both.

Similarly,
>>8027
I don't recall there being any law saying that some borderline images can't sit in two categories at once. It's practically mandatory on some heavily tag-based imageboards after all. And wouldn't it be in the spirit of conjoinment for something to straddle genres?

Besides, IRL conjoinments need not necessarily include a head...