Dancefloors are for dancing! So dance! Generally i won't kiss on the dancefloor but just flirt and have a good time. If I start to kiss someone then i normally move away from the dancefloor.
On a packed dancefloor your gonna get knocked if ur standing still! If a couple got arsey with me because I was bumping into them I probably wouldn't be happy about it and tell em to find a room!