The only thing that would persuade me to wash towels after each use would be if someone in the house had scabies (or similar!) They don't, so I don't
That said, I don't do all the washing in this house anyway - I do mine, Mr Urch does his. It will only be if I can't make up a full load that I find something of his to put in too.
I refuse to have a drier as they cost a fortune in electricity - and make your clothes go funny shapes
So the answer to the towels question is:
MY towel is washed once a week, and goes on a rad to dry immediately after I have used it, so it doesn't get smelly
I really don't care about skin cells - I shed those all day every day and can't believe that the ones on my towel are any worse than the ones in my bed and I certainly wouldn't change my sheets more than once a week either! (except when AF makes it necessary)
And given that I bath every day, and all of me comes out clean, I'm not unduly worried about the face/bum thing
Mr Urch is responsible for his own towel, and I suspect it gets washed a lot less frequently than mine
My suggestion for the OP is that they get towels in a different colour for him, and he can use as many as he likes - but he is also responsible for washing, drying and putting them away - and may not pinch hers if he runs out. Sorted