@Playalot, I've experienced the same problems as you--abductions only rarely and no male pregnancies at all (from abductions or woohoo with female aliens/townies).
I didn't even understand why the change occurred until you mentioned it in a post in your dynasty thread.
The topic's being dicussed a lot on other sims 4 sites. For example:
http://forums.thesims.com/en_US/discussion/829019/what-about-us-alien-lovers-want-male-pregnancy-backIn my dynasty file, the male founder and J Huntington III got pregnant pre-patch. The founder's been abducted several times since but without becoming pregnant.
I'm in denial about letting J Huntington's alien son (name's Jayden) go, so I've been ramping up the chances of him getting abducted (2x) but he doesn't return pregnant.
He's been romancing 3 female aliens, resulting in five pregnancies without him getting pregnant.
I'm so disappointed and feel the "ratio" of male pregnancy has been dropped impossibly low.
For awhile, I've been trying to get Jayden to procreate an alien daughter, which I'd hoped to use as a pollinator. But I realized that plan won't work now (because the close-to-zero chance of male pregnancy).
I found the random abductions and male pregnancy quite hilarious, and wish EA would give users an on/off option for abductions/male pregnancies.
In an interview with Kotaku, a SimGuru suggests that male pregnancy has been "patched out":
http://kotaku.com/the-sims-bug-makes-men-pregnant-1701332708Oops, this post turned into a rant instead of an answer to Playalot's question.