Clearly, the stone age men who had oral sex reproduced more. The stone age men who did not practice oral sex did not reproduce and died out. Before having sexual intercourse, these should almost always be oral sex. The saliva provided by the oral sex will improve lubrication and increase the sexual pleasure experienced by both partners. In addition, oral sex provides time to attain sexual arousal.
Women take a few minutes longer than men to become sexually aroused.
Oral sex prolongs the sexual experience and provides the woman with the time she needs to become aroused. Most men do not realize this. They think that just jamming in their own large penis will provide sexual pleasure to the woman. This is not the way it works at all. First, the clitoris must become hard.