If you play as a HNM, in the conversation with your mother, Lady Landra says something along the lines of "You're too kind dear boy. Didn't I spend half the salon flirting with you?" And Dairren interjects something like "Right infront of your family too, mother." Later in the conversation, you get the idea that Iona is interested in you as well.

It's pretty funny, I think. So is telling Fergus "No less than three, if you please." when he talks about you finding someone special eventually. His reaction is funnier if you're a HNM. He tells you that someday you'll meet a real woman, who you'll want something more than a roll in the hay with. As a HNF, Oriana tells you that such a thing could scandalize your house and to be careful.
The generic HNM is such a player. He's got Delilah, Lady Landra, AND Iona.
Even playing as a chastely uninterested HN makes you feel very connected to the Cousland family as a whole. My HNF plays with the possibility of marrying either Dairren or Thomas at the beginning of the origin. Being polite, and conveying slight interest without throwing herself at Dairren.

Mostly because her mother wants her to marry, and have children as well.