Unlike most other RPGs, just randomly killing shit won't do you much good. You can get decent XP from doing quests (Noer repeatables can be done pretty quickly once you get into a routine) and rescuing crawlers from goblin lairs - interact with them to follow then lead them to exit, and next time you talk with guild clerk you're gonna get bonus XP and cash for the deed. Watchtower North of Noer is good place because of short backtrack, just mind the traps.
Also anything that burns stamina nets little bit of XP, including walking around overencumbered, just make sure you have enough food. If you got 10+ SUR you can make decent exp and money by mass-producing dry meals and smoked meat.
But melee Lona shouldn't really need to grind, as soon as you have Tough+Bloodlust+Quality Weapons and can afford Halberd or Saber with appropriate off-hand you don't really need any points in COM, you're good to take down any non-boss as long as you engage them 1v1 and are a bit clever about it - ambush at corners or open with distraction rock followed by stun and backstab. Just exploring the world and doing non-repeatable quest should give you smooth enough progression.
Attempting hybrid build for what seems to be you first playthrough is hurdle of your own making.
Taking magical weapons locks you out of Nympho personality, which would have given a decent Sexy buff for prostitution. While not taking Timid personality robs you of WIS bonus that would have been useful for spell damage.
As long as you're on easiest difficulty you can get some permanent Sexy by stacking Seedbed status
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(on higher difficulties there is a downside from lactation becoming constant stamina drain)
Lona can get temporary Sexy buff from
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You can optimize Lona's Sexy a bit with the right hairstyle and other accessories (eg. necklace). While stuff like Glasses will give WIS at the cost of Sexy. For a hybrid build you'll generally need to juggle gear quite a bit.
If your Lona gets assaulted it has little to do with Sexy but because her Weak is too high.
Cheap piercings are a good way to get more Sexy at the cost of raising Weak, good thing is they only "count" when exposed, so belly piercings won't get Lona in trouble walking down the street as long as she keep the shirt on.
Check Fishkind Island village for more clothing option and quality piercings (more +Sexy with no downside).
And since I'm already in lecture mode
"boughted" is not a word, past form is "bought" or "have bought".
In a way the humble rock throw is the mightiest trick in Lona's entire skill set.