So is author really saying ML doesn't know how to masturbate and needs them to help him? Makes me question MLs age.
Why else would he just not make some good sword to sell to get some funds before worrying about other things.
Considering he was actively masturbating chapter 1, the problem isn't he can't, but that it isn't working like it did back then. His fantasy with Elsa (and other factors) means his holy juice isn't as holy (or as much) as before. His fuel is mostly empty in the important ways.
He's also been working as a Blacksmith for 5 years, so we can probably squarely put him in the 16+ bracket. Considering
he enters an adult shop in chapter 5.1
We also know Kurt here does repair farm equipment among other things, so they do have some small income (enough to handwave how he has an assistant).