Re: [Space/Aliens] Reproductive Features: alien, exotic and weird ideas
 

I made a set of creatures where the females were roughly human-sized with ST around 20, while the males were around six inches tall and had ST 10. They were humanoids with lupine features, though I've considered retconning the males to be sheep-like.

The females spent most of their lives trying to gain weight, while the males would try stay slim.

The way they mated was for the female to swallow the male; when his body broke up, his loose sperm cells would impregnate her. Her stomach could never be used for eating again, and thus the attempt to store up as much fat as possible -- to stay alive and teach their young as long as she could before dying of starvation.