On the issue of transactional sex, we should know that men from the days of our fore fathers saw women and still sees women as tools for their own sexual pleasure,men grew up believing that sexual pleasures were meant for them and women were theirs for the take.
Men felt free and wooed women, they cajoled them into submission , but unlike men, women were taught from the early stages of their lives to avoid sex, no touches no kisses except it's their husband , that is inside marriage, and I don't think that civilisation has erased this at least not not in an African setting.
Even amongst the evolved men and women one still meets parents who talks sternly to their girl-child on the need to be careful with the boys and to not let the boys gain access to the private areas of their body.
It is a common sight to a man for a girl to curl up into herself the moment a man tries to touch her, objecting to the masculine touch which seems to most people as the first step to initiating sex is one thing every man expects, the men had to beg, pet and cajole to make the women soften and melt for them, and eventually accept the "offer " to lay with them.
It was in these process of "peting and cajoling " that gifting came into the picture ,it was. MEN who started buying sex,
Because the women usually objects to sexual advances, men would promise them money, gifts etc, in fact a man who is on the stage of "explosion ' can promise a woman his lineage inheritance just for her to let him inside her.
Men did a lot of outrageous things for women because of sex.
As time go by women latched on this men's weakness and seized the opportunity to get by,women started thinking of the power they have down there, "since these men can actually agree to hunt down lions just to get inbetween our legs, let's use our power to get the other things we need that they can also afford to give".
from there it became a game of using what you have to get what you want.
it became trade - by- barter. I will not forget to remind us that till date,men still believes that women are tools for their sexual pleasures.,there are men who believes that women don't have the right to express themselves during sexual intercourse, in fact to them women are not allowed to make any sound during love making, if they do then it automatically means that they are promiscuous, their husband will start asking them to name all the men they have been sleeping with, but that is a topic for another day.
There is of course no gain trying to twist the truth just to make the womenfolk the devil.