She wants to get pleasure (for any healthy girl sex is a pleasure, no less than for a man) and any material profit (time, gifts or gifts are material goods), doing nothing for it. Why should you pay for sex, why not get pleasure from each other?
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Sex is pleasure, yes. With a skilled man who in bed thinks not only about himself, looking at porn, but also about the pleasure of his wife. It can be done without flowers.
But the average guy gives pleasure to a woman or does not know or does not want to. So here he will have to compensate for it so that at least someone in bed will suffer him.