Lust kind of snowballs. Your power with lust attack increases when you can afford Sexiness gear, increase your tease skills, and if you choose to use Lust weapons. The problem though is that the capacity for things being defeated by Lust remains constant with only a few cases of enemies 'healing' their lust damage.
The sense function feels useless after a while. Once you have one of your tease skills high enough it seem to matter what you use it on and it's always effective especially when you start get Sexiness gear. I think enemies interest in your type of tease should matter a lot more for resisting it. It might also add a little more interesting if enemies become more resistant to your lust attack if you tease with the same type each time?
It's weird that you have body armor on yet something like a bra still effects how sexy you are in combat without removing the armor first. Most armors should probably penalize Sexiness gains from undergarments unless you strip mid combat or something. Having Sexiness penalties on some armors themselves could also be an option for the sake of keeping things simple.
Maybe lust weapons can be another type of attack you can use rather than replacing your physical weapons. Though, if that happened their stats would definitely need a reduction. One of the problems with Lust s that there are enemy types that are completely immune to lust damage so in that case you're potentially doomed to lose at the start of the battle.
Lust based abilities would be cool. Maybe ones you have to learn somehow rather than starting with?
Maybe the Willpower stat could increase lust 'HP' or to lust attacks?
Libido could also be related to increasing lust damage rather than just simply grinding out tease skills. It doesn't do a whole lot in the game. There's only a few functions you can perform by having high Libido like public masturbation and longer sex scenes.
More enemies focused on teasing you to death? All enemies do physical and lust damage but it might be nice if some enemies didn't do any physical damage and just resorted to lust damage. If they were more dangerous in that way getting lust resist would matter more especially since a player can't be immune to lust attacks.
Tease attacks seem to ignore blind. If an enemy is blinded sexual displays should probably be less effective as they can't really be seen too well. You could say it should effect the users as well. If someone is teasing you but looking off in some random direction it probably wouldn't be quite as hot as looking you in the eye.
Lust damage affecting physical is possibly another place it could touch. For example, when your lust starts to get high it could affect your chance to hit or evade.