Now having said all of that.....
Do you think birth control and rubbers and spermicides etc are getting in the way of this natural process and if it is, and intentionally so.....
are we confusing all of our inside mechanisms that gave us enjoyable sex for reproduction and the passing on of our seed?
Well, studies have suggested that birth control does have the potential disadvantage of making the women prefer the scent of different kinds of men than she would while off birth control. e.g. same immunological profile, as indicated by phermones, versus different. If I recall correctly somebody conjectured that while a woman was pregnant in pre-civilization societies she tended to seek comfort with relatives. Birth control basically makes your body think it's pregnant even though it isn't to prevent ovulation.
However, controlling when and if pregnancy occurs was huge for empowering women. Women who are serially pregnant are at higher risk for certain health problems and it is much less viable for them to have careers. This was fine when the idea was to produce the maximum number of offspring but bad when you want to produce an egalitarian society.
The natural mechanisms you described exist for exactly one reason. In the context of pre-civilization humanity and species that came before them it maximized the number of viable offspring for the next generation. Men do have different natural inclinations than women because the strategy that maximizes their viable offspring is different. Jealousy has likely always existed as it is a mechanism of trying to mimimize people using you like a cuckoo.
About 56 of the Old World species and 3 of the New World species are brood parasites, laying their eggs in the nests of other birds
Cuckoo - Wikipedia, the free encyclopedia
Much like our metabolism, natural sexual impulses can conflict with the context of a modern world, e.g. we have norms that directly conflict with typical male inclinations (monogamy). However, I would argue that sex is the addiction that is healthy to feed in that same context. Studies show that having lots of sex in a stable relationship reduces stress, lengthens life, and helps bring couples together. Without sex that outlet is not available and life would be much less enjoyable and also shorter.
Are the stereo types that have been there for woman still appropriate?
Are women's inhibitions dropping because of birth control or do they no longer have the desire for what once meant most to them, a child...carrying on her own bloodline, an offspring?
I don't think so. Inhibitions are dropping off largely because of cultural changes. In the Victorian era it was considered abnormal for a woman to enjoy sex. She was supposed to lie back and, "think of the empire." America's puritannical heritage is scarcely better.
But there was a reason for such strict morals during those times. There were no paternity tests. A woman who philanders about was going to produce bastards, but these days birth control makes that less likely, and thus makes it less likely that fornication/adultery will produce unwanted children.
And are men having a stronger desire to screw more women because they know that many will not be able to pass on their offspring due to BC?
I don't think so. Men want to screw a lot of women because that's what produced more viable offspring when natural selection pressures were there, but it's not because they have an actual conscious desire to produce offspring. Natural selection isn't occurring in the same way it used to, if at all, so there is nothing driving such a change. On a conscious level men desire sex for the feeling and release. This may make them not want to use a condom, but not because they want to produce more babies.