A quote from page 206 of "Fagin the Thief" by Allison Epstein that reads: It's not as if romance is something he's been actively denying himself. He never thinks about it, considers it irrelevant.
I am only about 210 pages into “Fagin the Thief”, but I am completely convinced that his backstory shows Jacob Fagin to be asexual. Even before they knew, or coined, that term. #FagintheThief