At first, it was awkward to show any affection in front of each other. I don't think I would ever be comfortable making out in front of one of them, but hugs, kisses and touching now occur regularly between either my husband or boyfriend and I. I very clearly remember meeting my husbands girlfriend for the first time, the 3 of us went for coffee. As she was leaving, he gave her a hug goodbye, his head resting on top of hers. It was beautiful (go compersion!), I really loved being able to see him show such tenderness towards someone else
My own personal belief is that showing affection is natural and healthy. Just as kids seeing their parents show affection with hugs and kisses isn't overtly sexual, it's just demonstrating the bond they have with one another.