Let me theorize for a second, as I often wont to do. What people usually find attractive in the opposite sex (I don't understand same-sex attraction, therefore I'll refrain from commenting about it) are the distinguishing features of that sex. Meaning attractive women are womanly and attractive men are manly. Thus men are attracted to breasts because they don't have any (that's my theory anyway), and round buttocks, and despite recurring fashion for men to wear their hair long, long flowing hair. Generally, curvier and rounder features, and a non-intimidating size (or maybe that's just me). Women are (supposedly) attracted to tall, broad-shouldered, muscled men with more squarish features (and possibly more body hair). And of course, kind eyes, or a giant throbbing erection (just for her!), whatever the case may be.
That's all pretty simple and generally well understood, at least by people who are weird like me and like to overanylize life instead of just living it. What I don't understand is the use of "calloused hands" as an attractive attribute of men. I don't think the feeling would be pleasing, and unless the guy is in Oxford crew, it would almost certainly mean working-class. Why is that attractive? Or does it simply mean unprofessional, not thought-out, copy-paste writing? I do speak of fan fiction, after all.