No. The only effect regular masturbation will have is to lower the volume of ejaculate at each emission. A short recess will restore volume within a day or two. Any erection malfunctions are caused by physical or psychological issues. The notion that masturbation is harmful is thankfully being debunked for what it is, scare mongering by repressive individuals.
Superbly said Andy....do you think it's a bad sign though when you reach climax and nothing comes out? Is that a sign that maybe 12 times a day is too much?
Perhaps you have all missed the point? :-)
Normally Masturbation DOES "affect a man's ability to become erect". It Normally causes it!
It is also a common cause of the generatio of a sort of white goo! After this event, which is often accompanied by muffled yelps and a search for the tissue box, further masturbation has much less affect on a man's ability to become erect. It Normally fails!