For most women in the US this would be a dream come true, I do not have to work? In this culture it is almost unheard of, at least in younger generations.
However, now put a Mexican woman who is used to being provided for in a relationship with a man who is used to his girlfriend paying half the bills each month.
With all this being said, and this is also something that has changed a lot with younger generations of Mexicans, sex is not an automatic is no commitment has been made.
Typically Mexicans wait until there is an engagement or even a wedding before they become sexually active when dating.
It can be a form of courtship that consists of social activities done by the couple.