I find "Aunt Flow", as I like to call her, makes me want to get busy all the more!! It may seem unfair that I feel the urge even more during this time, but I want that orgasmic release and so I usually end up saying to heck with blood. Put a towel down, use the shower, whatever you have to do, why let a little blood stop you from masturbating? I typically cave to the desire by day 3 of my period lol. Some men even still enjoy sex during this time!! Why miss out?