The reason there is so much need for abortion is unplanned procreation. The end game can make you forget to take the needed precautions. The carrot on the stick is the pleasure and excitement but the end game has it own needs and can cheat your choices by tweaking the carrot.
I remember in College going South for spring break with the track team, to train with the track team at a warmer prestigious southern university; Duke. It was still cold up north, and this trip was designed to get us ready for the spring season. They had a world class track.
Many of the girls at that university were Southern Bell types, with the cute and proper accents, all dressed up in their spring dresses, instead of sweat shirts. When we went back north, the girls that once looked pretty lost their luster, after being around the southern bells for a week. But as time went on, their shine came back. The carrot on the string helps one get back in the game and this can become relative to the situation. This affect occurs each summer during bathing suit season where the stimulus increases and then moderates.
In terms of the end game of procreation, male and female have two different end games. The female is not done after sex and fertilization. She has to go through pregnancy and since human children are not self sufficient at birth, she then needs to care for them many years after birth. The endgame for the male can be over in one day.
Altering secondary sexual characteristics with drugs and surgery will not change this. One would need to alter the DNA. This explains why gay men are often ho's. They still have the male end game, even if the carrot on the stick has been modified toward the same sex. Will and choice and culture can tweak the carrot on the stick, but the end game is assigned at birth, based on DNA; survival of species.
When you have biological males in female sports, the endgames of the male are not the same as that of the females, even if you dress up like a girl. The longer time scale endgame of the female often involves the village; female cooperation, whereas the endgame of the biological male is more individual; charm, glory today, and move on. Girls fall for the charm, but when they get used, that turns to scorn. Sports separated by biological sex takes into account the similar needs of the female and/or male end games.