The perverted:
Do not speak for everyone. A man should not like a pregnant woman. This is a natural mechanism so that the male does not climb to the pregnant female. ......
This is the case....

The natural mechanism is called "flow" and is quite specific. So if you, don't give god, attracted to a woman who has not yet begun to clearly express a willingness to mate, take characteristic poses and spread a specific smell around yourself - welcome to the perverse :)