From what I can tell about L-based weapons, is that they are kind of pitiful.
Is better to keep damage dealing weapons for HP instead in case of enemies who are immune to L-based attacks.
If you want to deal more damage with lust, I would recommend items/gear that boosts overall tease attacks.
Or even the bimbo Siegwulfe NPC you can get for your ship.
You can equip her as an Accessory, and during battle she does tease attacks for very small amounts of damage (like 3-10 damage I think?).
For all we know though, later on L-based weapons will get an overhaul or have new ones added that are OP if used right.