Serious sex question?!

Serious sex question?

I seem to really get (happy) when it comes close to my wifes period. Not during, just when it is getting close... Please no silly answers (well maybe a few) is this normal? by happy I mean excited? We have been together forever and it seems to get worse every month...

2 weeks ago
We are both pushing 40. If that helps..

Maybe it is because she is ovulating.

1. Hidden ovulation
Though some studies suggest that men and women do have an unconscious sense of when a woman enters a fertile period and is ripe for mating, there is no obvious outward sign as there is for most mammals. Many female monkeys, for example, get bright red butts when they release an egg. But women are poker butts, even to themselves, which is why they are left to temperature-taking and guessing in order to time ovulation.

Dr. Leonard Shlain, a San Francisco surgeon and author of “Sex, Time and Power: How Women’s Sexuality Shaped Human Evolution,” speculates that ovulation had to be concealed because women wised up and realized sex led to pregnancy, which led to childbirth, which often led to death for the woman. “Once women understood they could die as a result of having sex, why wouldn’t they abstain from sex?” But if women did not know when they ovulated, they wouldn’t know when they had to abstain in order not to risk dying nine months later (a theory that assumes they had a choice about whether to have sex).