This is a very curious comment to me. So evolutionary strategy makes your T-levels dip to allow you to focus on your partner and the nurturing and protection of the newborn.

And that is bad - how? Why do you need to distract yourself from these very important events and spike your T-levels artificially in order to enhance your interest in other mating possibilities?

This makes no sense, neither from an evolutionary nor from a moral point of view. You are effectively advising your readers to jeopardize their relationships and their children's chances later in life because of some entirely un-scientific view of what masculinity is: always ready to father, never to be a father.

Congratulations and be sure to include a Porsche on the list of baby shower gifts!

I am not an expectant father but I could probably use your prescription. Should I consider the Porsche Cayenne model or the more classical 911 line?

The solution to the Cayenne vs. 911 dilemma consists of the following. The Cayenne does not have that sportestosterony feeling - too vanny. Conversely, the 911 will not accomodate wife and car seat. Hence, why not consider the Panamera, the new 4 door / 4 seat Porsche sedan?

From what I read, testosterone has a beneficial effect on libido in women, too.

So maybe it would be an idea for your postpartum love life to give the Porsche to your wife??

Going to bed much less worried about your family today than yesterday,
Claudia :)

I am waiting to read the full paper, what a simple and elegant idea.
I believe your T levels have already dropped while your wife has been pregnant, and you will probably feel it even more as you become more and more involved with your baby.
As this is your first child take note that sometimes the attachment is not immediate, especially for fathers whose attachment may delay untill the child is older and can talk.
You are in for a very special experience.

This article reminds me of an 80's music video - self-indulgent and pointless.

I have heard from several women / girls that they find men with a young baby / child to be very attractive. I guess it signals "willingness to invest in offspring" which is valued in a species requiring high parental investment from males. In that sense, the reduced T-levels of fathers-to-be seems adaptive. They would be less likely to pursue the mating opportunities available due to their newly elevated mate-value. Is that part of nature's way of equalization?