For myself at least, I have a theory that may partly explain why this happpens: Its the Progesterone Ive been taking. Estrogen is high grade gasoline, but Progesterone is rocket fuel. Progesterone is often prescribed to Trans women to help w/ breast development. Progesterone is also present in large amounts in Cis females when they become pregnant. It helps to "mature" the breasts in preperation for being able to feed the baby. Ive been on Progesteroe for two years, but didnt initially see much for any results. Then late last year I switched from taking it oraly to rectal intake. I had heard this was a much more effective way to get it directly into my system. Within a couple of months, two things happended; Boom, my boobs went from B/C to Ds, and guys started to look MUCH more interesting too. Just maybe, my body is trying to tell me that I should get pregnant, so I should try to find a guy. I know that Progesterone doesnt work the same for all Trans women. Some swear by it. And some swear at it. IDK. BS, maybe? YMMV.