I am very, very curious about the effects of masturbation on women... and yes, I am a 16 year old boy. Why I am I so curious? Because I noticed my ex-girlfriend who was passingly curious in karezza / sacred sex (not nearly as much as me!) suffered all the same side-effects of masturbation as I did whenever she finished (emotional coldness / disinterest, mental exhaustion, etc).
I had already quit masturbating (which was very easy for me, personally) long before I met her and always wanted to bring it up to her that her masturbating (she did this on a daily basis) was causing her suffering (and for us as a couple, too) but I never had enough research to back it up. Almost all of the articles and stories on the very real dangers of masturbating daily are about men and boys. This makes sense, but surely women suffer from it also.