9 Dec Well, if a man and his partner don't mind how long it takes him to ejaculate, then it really doesn't matter. For example, Ian Kerner, PhD, a sex. Therapy usually involves homework assignments and exercises intended to help a man get used to having orgasms through. 20 Oct I enjoy sex with my girlfriend but can't ejaculate during sex. to self-pleasuring in a particularly rough way eg using high friction with a towel.