Never heard about the hands thing so what kind of hands they like?
Well like with everything that entirely depends on the girl/woman some like strong hangs some like em slim it depends on the woman my friend
what I can promise you is that they don't dig dirt under finger nails or long fingernails in general.
This is one reason why woman in general have a tendency of getting interested when they figure out that you work out, it has in most cases nothing to do with your "massive shoulders"
but more with the fact that you "seem" to "take care" of yourself as in workout eat healthy and all that good stuff.
Again if you have a super tight shirt or a green wifebeater with ARMY written on it I can promise you right now that most of the woman who are worth keeping will not give you a chance quite the opposite most woman like a man who is YES strong and all but doesn't make a big deal out of it.