More than a little presumptive, and just a bit sexist.I know some of you guys are married and don't exchange gifts with your wife. The first excuse such people say is "we buy our own stuff when we need it".
What I do know is that the wife tends to follow her husbands wishes. And I'm betting you guys that don't exchange gifts brought it up with your wife first, not her. Deep down she wants a gift. Know her size and get her something cute. Show her that you think she is beautiful.
Good job.