3) Going for transgender operation. Maybe becoming a woman might lead him to have better controlled urges.
This is so not right thing to say.
Naturally, majority of women do not have urge to be wildly promiscuous and hence it is, I believe, completely wrong to say that they have better control on their urges (which by corollary can be proved as well). Being promiscuous is not one of their major urge.
Now if you want to judge better control over urges, you have to compare natural male urge to natural female urge.