do you mean trading as in You Give Me Hugs and I'll Give You Sex?
or do you mean you want hugging instead of sex?
you could always try to incorporate hugging as part of foreplay. If I don't get to cuddle after sex it sometimes feels incomplete. and I agree, reluctant affection isn't the same. I don't really have any ideas or advice since she knows you want hugs but doesn't seem to enjoy it.