I was about to say I've never been aroused by a hug, but it's a lie
I guess the main issue would be the determining factor of the hug. In my case it'd be guys
I've had plenty of guys hug me and nothing, as is normally the case. But every now and then a guy will hug me and really embrace me and I get aroused. I think it's more from the contact and feeling behind the hug than an actual physical attraction.