im not sure i know what you are pointing at. did the test subjects have 900 love ?
ah nevermind i forgot i had ai shadowsets installed. when they are disabled the singleminded fully blocks even 900 love attempts to hug
however, it does seem if you have a lover already, at 900 love there is a greater than 0% roll when you ask a singleminded to be your second lover (as long as they are single)
i take advantage of the singleminded trait as a significant portion of my slutprogression mod. i give it to everyone in the class and require sex experience to remove it, while also having a couple mods the slightly curb the singleminded behavior (for example the mod "Everyone Wants" gives a small chance depending on love to accept interactions (with default settings i think 900 love gives around a 20% chance to accept hugs for example)
then i let low virtue break the singleminded trait once they have at least a tiny bit of sex xp.
i feel like this makes the game feel a little more normal, significantly reduces the average slutiness of new cards across the class. makes it much harder for guys to get in relationships as well instead of just stuffing pies from day one. and in general when relationships form between npcs they last a lot longer
then on the other end i make sluts a Lot more slutty across the board by giving them all kinds of slutty modules lol.
the final big piece is a number of modules that lower the virtue of cards the more experience they get, so effectively everyone slowly turns more slutty over time unless they are celibate
so basically the slutprogress module is designed to widen the entire spectrum in both directions. Far more virtuous, and far more slutty

mostly just to expand the gameplay so I dont get bored of classes quickly.
particularly nice now that im using cardswapper to have around 200 cards per class lol. i can take the class into the hundreds of days range and still see dynamic action between classmembers
also
if you get that lewd promise fulfilled make sure to build a lot of h compatibility since that stat makes a huge impact, might be enough to get above 0% on requests
edit: the more i think about it, could be fun to play a class of all lowest virtue+singleminded and block all steady relationships. you cant pursue any directly, they all have to pursue you instead lol
update: i made test class and day 1 first moment i stepped into town one of them did Minna H and they all started fapping lmfao. so thats another thing they can do. aaaand just verified they will straight up ask to get plowed right in the classroom even lol
so thats kinda interesting, and gives me ideas lol