For combat, dirty rags outfit is much better for juiceable enemies. They literally start jerking of in front of you or try to slowly grab you. With whore outfit, if you are found out, its very hard to land the juice ability because you have low weakness enemies go full on, and with whore outfit you have a pathetic 3 defence, and with dirty rags you have 12. The speed is not enough to make up for all this.You can earn up to 5 copper coins every prostitution at the high end club in Noer. High Constitution Whore Lona can make very reasonable income if you alternate between whoring at night and doing some gladiator fights during the day (just save/load until you're fighting with juicing compatible enemies). It becomes particularly easy to juke in the gladiator given the whore outfit gives movement speed bonus so you don't need to sprint to outrun enemies in the arena. Sexiness is only necessary to hit the threshold of seducing the high end club goers. There is no reason to dial weakness or sexiness to extremes, and I don't see why it matters when Constitution is the main influential attribute for Succubus build. Piercings is entirely not essential, especially if you rebirth into Moot where you hit the sexy and weakness thresholds without requiring piercings. Hell, human Lona can strip naked and most enemies will switch to coupling half the time if she doesn't hold a weapon in hand.
Succubus Lona is one of the most low risk builds with some hard-counters that you can simply play around. Not juiceable? Just hire mercenaries for any real battles. Suck and blow anything else that can be sucked and blown.
On a side note but one of the easiest ways to make easy income before the change to seedbed (Womb) was just pumping out goblin babies while at 10 stack seedbed. Now that it forces you to lactate like a tap on full, it is a lot less viable given how much it saps Lona's stamina. Not sure if it's an intentional nerf but it sure as hell denied an easy money maker.
Thats what saddens me, I love those outfits, but you always have to take them out when actually playing the game, so I find myself barely using them at all.
Piercing are good because you can hit weakness level with weapons equiped, very important because the second an enemy sees you juice somebody to death, they will stop horny mode and hit heavy, and not having shield and a weapon when you cant afford to run around and aggro other enemies is hard.
You are right about the money from prostitution being good, but since I found out it loosenes wholes and loosened wholes lower heavily sex damage, I just didnt enjoy doing it. It seems like something you do in the endgame after finishing missions and just needing to get enough gold coins.