It would be very interesting if "wooing" were added to this aspect, though. Acquiring a mate shouldn't be as simple as "OK, now you're mine." Instead, it should be "show me that you're good enough" In which case, it would be a specific impetus to become a hero in the eyes of some civilization or other, AND the potential mate should have "dreams of raising a family" as their dream, which would further narrow the field of possible mates. This would create an in-game motivation for why a character should go to the trouble of "slay such and such, to bring glory on all of us".
It could become,
<kiss "target name">
RESPONSE: <target name> dodges! "If you would woo me, you must prove your worth!" <insert quest gossip here>
The Player could then attempt to convince the intended that <quest gossip> has been completed, regardless of the truth, using the "rumor" conversation tab, or by actually doing the deed and coming back to tell him/her.
Conversely, the Fame value might be enough all on its own to overawe the intended mate, so that they're "honored" to become famous by relation. (increase their fame rating to one less than the adventurer's, which would then make them targets for night creatures, attacking civs and possible goblin abductees - all good hooks for story-telling. Children would add to the "Companions" number, as well as conveniently mark anniversaries, since one is usually born per year. The children would have to receive one level less than their mother or previous sibling at the time of birth, to simulate the "13th son of a dynasty is unknown/must prove himself worthy of the crown" dynamic. Upon the adventurer's death, it would be simple enough to list the mother and all of the siblings who have reached adulthood by fame level and give the "head of family" title to the one with the most fame, but selecting the one with the least fame as a new possible adventurer. This simple system would allow for "off screen" fame increases for killing monsters, acting as mercenaries or becoming great artists or religious figures becoming the motivations for the least famous descendants as adventurers to aspire to best. A famous singer-adventurer's daughter must prove herself better than her sire, or always have people saying "aren't you the great so and so's daughter?"
The new adventurer would have the benefit of having relations with resources, and if they are mercenaries, it would be possible to recruit them as companions, (or even murder them in their sleep), but killing family should become itself a rumor option that diminishes the fame of the targeted individual. "RUMOR: <Target> is an evil monster, it is said he/she slew her own mother/father/brother/sister/ect...!"
If an adventurer has wooed (woo woo!) the potential mate, then the simple act of "sleep for Z hours" while that mate is also present should have a chance of creating a reproductive event in the female during the unloading/reloading process. "Between scenes" basically, which keeps the game minor-friendly the same way that not adding defecation has kept it minor-freindly. (I'm arbitrarily assuming that polygamy isn't an option for adventurers based off of Fortress Mode, even though it's a cliche that sailors and traveling salesmen "have a wife in every port/town", and many traveling musicians, artists, ect... basically keep a harem in the form of "fans" or "groupies" so why an itinerant Hero/Heroine should be any different, I'm sure I don't know.)
(Although, the choice to keep certain universal biological truths from being in the simulation does point to the various cultural taboos that Toady has. Vermin are OK, but dirt isn't, blood is OK, but not poop, one mate for life is OK, but not multiple mates, either serially or tangentially. I suppose that's another conversation entirely.)