First and foremost equality. If men and women were equals then men would have been given a brain that functions at the same time as our dick. Instead we are lumbered with a system that can only supply blood and therefore oxygen to one or the other. Never the two at the same time. He's a guy in charge of the trigger, and at the same time has no idea what to do with a cigar.
Women are by nature horny.
They are horny before their period, they are horny during their period and they are horny after their period. PMS is actually the time when it dawns on them that they went to the trouble of producing an egg, they failed to fertilise it and now they have to go and make another frigging egg. Life would have been so much simpler if they made the egg, fertilised it when ever they had time and didn't produce another egg until they felt like it. All this business of making the egg, getting rid of the egg and making another egg just because the moon is full again is just so tiresome. So, when women are horny, they have sex.