I've been in this situation several times, and never received a gift and didn't give any kind of gift other than the hostess gift as a thank you for having me over. It never really bothered me to be in 'the middle of things', so to speak. I enjoyed watching people open their gifts and seeing what they received. The only time I had a problem with it was a bf's very excessive gift-giving family, because I hate seeing over-materialism like that. But it wasn't hurting me, and it was their thing. At that time though, I was thinking that if we did get married, what in the world was I going to do because I am strictly only into giving small, one-to-a-person gifts to people and not countless, expensive ones like they were doing. I never felt uncomfortable or left out at all because this was strictly a family thing, and I was not a member of those families. And most importantly, I had just met them, so to be participating in a gift giving thing is what I would find very awkward and uncomfortable.