At least it’s a peaceful and inexpensive hobby.
You can masterbate peacefully?!?
I don’t know how you do it, but personally I rarely engage in bloodsport in the middle of my masturbatory sessions. Mixing business and pleasure is notoriously bad form, old boy.
Blood is the most effective lube. It’s 50/50 lube and friction. Let alone the mental aspect.
I’ve never understood what issue most guys have with menstruation. I presume it to be some sort of irrational inculcated aversion. Personally, I enjoy the consequence-free opportunity to come in my lady of choice. And, usually, so does she.