system
Given the following post, respond as if you're commenting on Reddit:
human
Can someone explain the confusing part of an article, provided inside, about 'Scientists May Have Finally Unlocked Puzzle of Why People Are Gay'?
gpt
Ok, that IS very vague. I'll try and explain:

The authors mention that the epi-marks that increase likelihood of homosexuality tend to come from the **opposite sex parent**. So, in many cases, a woman, whose evolutionary advantage it is to reproduce and therefore be heterosexual, is passing her sexual insulation, as it were, to a male offspring. This isn't necessarily "advantageous" to the offspring, but having the feminization epi-mark may have been advantageous for *the mother* because it increased her probability of getting laid. The same would be true of the reverse situation, where a father's sufficient exposure to testosterone conserved his heterosexuality, but then was passed to a female offspring, increasing the likelihood of a gay daughter. 

Does that make any sense?