Kinkiest? Not sure what would be the top but here are some things I’ve done.
Had sex with my gf in high school in the park. Not in a parked car. We were on a trail that wasn’t used anymore. We saw a group of large flat rocks off the trail. She said, “You wanna fuck me over there?” I said, “What if we get caught?” She said, “Nobody ever uses this trail. Even if, they will get a show.” So I fucked her there in broad daylight and both of us completely nude
Same girl. Her house is set up weird. You walk into a living room. Stairs against the right wall going up to another living room and kitchen. The bottom floor living room was for everyone. Top living room was for the parents. We were having sex on the couch upstairs. She had a shirt on but no pants. I had pants pulled down. She was riding me cowgirl when her parents walked in. They headed upstairs. She pulled a blanket over us and spun around. We had a conversation with her parents with my dick still inside her. Her still slyly bouncing up and down on my cock. As her parents went downstairs to their bedroom, she spun back around. Threw off her shirt and said, “I’m close to cuming. I know you are. We have like 15 minutes.”
My current wife walked in on me and her gay friend. I was bent over on the couch. He was fucking me. She didn’t say a word. Just dropped her purse, jacket and took off her clothes and said, “Let’s go to the bedroom.”
First wife and I were at the other couples house. We were playing spades. Dave said, “Next hand, if we men win you gotta make out.” My wife said, “And if we win?” I said, “I’ll suck Dave’s dick.” Wife said, “Right here in front of us. And you have to swallow.” I looked at Dave (we hadn’t all had sex yet) he said, “Ok. Deal.” We men lost. Dave dropped his shorts and I sucked his dick right there at the kitchen table.