How does an alien men pregnancy start?

Alien babies get different birth certificates too, if you have them at the hospital.

how long does the pregnancy last with males?

Okay. All is well. He is pregnant. Just got the moodlet and belly :D

Hello
It is exciting that your sim will soon give birth to an alien baby! :)

I know that now :D Wish you had answered sooner :)

Anyway, my male sim had twin girls:
http://i877.photobucket.com/albums/ab339/Pildid/gp_zpsuyknykpd.png
I'm not gonna send them to their homeworld but I'm not gonna play them either. Gonna move them to a different household once they're older.

Congratulations to your sim on the birth of the twin girls! :) It is nice that the children will remain in your world, with another household. You will still be able to see them in your game.

Try playing them, Aliens have some unique interaction they can do and, they can revive dead space creatures too. When they get older, you can take them to a mirror and give them hair, makeup and all. Aliens can be cool to play.

Congratulations, @Simpkin :)

You are so lucky i am trying to get my male sim abducted but its so hard ugghhhh.

"Samtaplet;15154773" wrote:
You are so lucky i am trying to get my male sim abducted but its so hard ugghhhh.

Hello @Samtaplet

Some things to do to help your sim to be abducted are
for him to be in the science career,
to have the satellite dish and try to contact aliens,
have him be friends with aliens ,
having a high level in the logic skill can help ,
having space rocks at his home or in his inventory ,
and using the " out of this world" desktop that is unlocked with the science career at level 10 to "contact aliens"
I hope that your sim gets abducted soon! :)