Most males are promiscuous (Bateman 1948; Leakey, 1978).(6) Genetically, it is the most practical course of action. The more females with which a male mates, the greater number of offspring containing his genes are possible. In addition, the cost of sex in terms of time and energy is considerably lower for the male than the female. It is therefore in the male's (and thus the male's genes') best interest for the male to mate with as many females as he can.
Thus, a male's criteria that a female should satisfy can be quite simple: 1) the female must be healthy to carry the fetus to term and support it after birth until it reaches self-sufficiency or puberty; 2) she must be young enough for greater viability, health, and ability to support offspring long enough after birth for it to reach self-sufficiency or puberty; 3) impregnable condition. As is apparent, all of the above criteria are physical and usually obvious to the male's eyes or nose. In other words, a male can quickly see and/or smell whether a female fulfills his criteria. For example, a female cockroach releases pheramones (a chemical scent) when she's sexually ready that draws males from everywhere. The female chimpanzee's sexual organs swell and redden when she's receptive, and the males line up in hopes of mating with her. Nothing else is important -- to the male.
In addition, the sex act is of paramount importance to the male; it is how he impregnates the female. She must therefore be receptive to him. After that, his concern is having more females to impregnate (Bateman 1948). He may try to ensure that his already mated females don't mate with any other males, but the more successful he is with the former, the less he probably worries about (if those are the words for something he doesn't think about at all) the latter.