The high school I went to during my freshman year, there were couples at nearly every turn involved in PDA. Initially, it was a little unusual to me, because I wasn't used to seeing that, but I got used to it eventually. I guess that experience has caused me to become unfazed by PDA now, just don't be leaning all on me.
When my ex and I went to Six Flags, there was another gay couple in front of us when we were waiting in line to get on a ride. One was sucking on the other's neck without a care in the world, and I thought it was the cutest thing ever

I think it made my ex feel some kind of way, because he started getting really touchy with me a few minutes later
