Has anyone forgotten the superhuman strength and growth space marines have? Like, they would be nearly twice the height of a human female. Gold medals and roses to those who carry children of the astarties.
I like how OP is clearly not about SM having sex and yet that's where the conversation inevitably turns.
A women who had intercourse with an astartes would have to then stay at a hospital for about 2 months, that if somehow her pelvis didn't turn to dust. Still kuddos to those women, bearing the Emperor's fury. Lol.
What? Human urges? We're talking about biological urges, not human ones. All SM have human urges, even the Ultramarines who can be just as involved in the societies of Ultramar as Salamanders are with Nocturne. A child of an Astartes does not inherit any of his Astartes Genes or traits, they are born as an ordinary old human! Even if they conceive the child whilst being an Astartes! And I know that last bit will set off some Slaaneshi stuff, but I really don't want to touch that with a Bargepole of any length! The post above is a good example of what I don't want any part of!