Yes, it is quite uncontrollable for young couples when they are isolated from other people, alone together. For the males the timing is right 90% of the time, whereas in the female she must be soothed and made to be uninhibited regarding any religious teachings or family constraints, or be deeply "in love", or just plain want to experience the ultimate intimacy. Some do not feel these things as much as others and even when felt, hormones are powerful drugs and even in some females it can be an uncontrollable urge. This stuff's pretty obvious