I'm 31 and I masturbate regularly... ok, thats not true, I masturbate a LOT! Probably way more than the average guy (3-4 times daily, sometimes more, but never less) and I've noticed that my penis doesn't get rock hard. I compared it to my friends boner, he's 24 and almost never masturbates and his was solid as a rock.
Does to much masturbation cause a dick to not get as "excited"? as it otherwise would? my dick, is only 5 3/4 inches, it used to be 6 when i was younger (I think) and it never stands straight up like it used to.
I can make it harder by flexing it, but trying to do that constantly during sex is pretty tough. Should I just exercise that muscle by flexing it all the time and releasing/? would this help me achieve a firmer erection?