They chatter with one man,
Look at another with amorous gestures;
And in their minds think of yet another,
Who then is loved by a woman?
From: Bhartrihari [7th Century]
When you read these lines, the immediate thing that you want to do is to find a woman in your memory lanes that fits the above bill. One will perhaps find not one, but many. But, perhaps this also applies to men, in fact I think they are more likely to do so, if you accept the explanations from evolutionary psychology and comparative psychology.
In evolutionary psychology they say that the males want to produce as many offspring as possible. So they try to mate with as many females as possible, many times the quality does not matter, only quantity does. This is so because the males do not have to invest [sic] a lot in mating. The analogy that is often given to the sperm production in males is to spam mails that hit your mailbox daily. Even if one in 10 million makes it, your job is done. But for the females the bodily investment is much larger. So females they say prefer quality over quantity. After the copulation it is the female who has to bear the child, and the responsibility of male becomes minimal. Imagine if a human male copulated daily with a fertile female, which I guess one can, how many children can he produce in a life time? Perhaps in thousands. Similarly if we think of human females producing children when they can, that is taking into consideration their biology; perhaps one child in a year, considering all other factors, the total number will be max at 2 dozen or so. So it is the males who would are more likely to be mating more than women to produce children and that too with many different ones, if they have the capabilities.
This particular observation is not general, and of course does not apply to all species. There are species of sea-horse in which the males rear the young ones, in almost all birds the rearing of offspring is the joint responsibility of the couple. In animals who have social structures, as in case of humans and monkeys, the young ones are raised socially.
But we being humans, do not copulate just for procreation, we do also copulate for recreation [of ourselves that is]. They say that dolphins and chimps are the only other creatures which do so, no wonder they are called intelligent. All other animals copulate when their natural cycle tells them to. So in this light of recreational copulation the above verses acquire a different meaning. There are women and men who copulate and want to copulate for recreation, it is perhaps their nature to do so, but perhaps they are bound too strongly by the social sanctions that surround them.
The next question to ask is that is it right for them to do so?
Well, the answer depends on what one thinks of such social norms. Are they to be followed in to to, or they have an interpretation dependent logic.
The answer is something that I do not know...
PS: Perhaps the essay might sound silly, it is; I have to expand on certain sections.
