Sperms are cheap. Carrying a baby in your womb is massive, potentially fatal investment of resources... I understand. So I think women are more picky, but rightfully so.
Most Helpful Girl
I'm not sure about girls being more picky. Most girls want either a smart guy or a nice guy or both. Guys on the other hand want a good looking girl, a smart girl, a nice girl, a good mother, a young looking girl, a good cook, a good house keeper, a happy wife, a stimulating and interesting relationship and some require she constantly appear fashionable or wear heels in the relationship.3
Most Helpful Guy
The evolutionary psychology approach to looking at this question still works in 2016-2017, but one has to acknowledge that the conclusion may be very different because of significant changes in circumstances.
Partner selection is not controlled by how much energy (in kilojoules) is required to produce an egg versus a sperm. The body is not trying to recoup sunk costs. The biological actors are negotiating the equitable distribution of risk between themselves.
In 2016-2017, the law is such that if a female get pregnant, and she doesn't want to keep the baby, but wants to instead drop it off at a safe haven (not even allowing the biological father the opportunity to asset any of his parental rights), the biological father is nevertheless still financially responsible for all of her medical expenses and time lost from work. In effect, this shifts the risk away from the female and onto the male.
Onto parental liability. The female has three options post-conception that do not require the other partner's consent: (a) morning after pill within 72 hours, (b) termination of the pregnancy eithin 90 days, or (c) carry the pregnancy to term and leave the child with a safe haven. Parental liability is something the female can literally "opt out" of. That's not at all the case for men.
As far as divorce goes, men generally choose professions and sub specialties within professions that pay more, work longer hours than women, and because employers generally frown upon men taking family or parental leave, have no breaks or gaps in their work experience. As a result, men generally out earn women for reasons unrelated to gender based employment discrimination "against" women. Family courts are infamous for having their mind back in the 1600s, so as a lawyer it's embarrassing for me to say this, but courts unfortunately still do instinctively have a bias in favor of the mother in terms of child custody and the lower earning spouse (even if that spouse is perfectly capable of being productive, voluntary laziness and dependence is not only accepted, but encouraged and rewarded).
So, you want to look at the "risks" a male and female takes on when entering into a potential long-term child bearing relationship? There you go. Now apply the evolutionary psychology methodology to it.0