Evolutionary significance of using hands while making out

I'm thinking about the legs that started on fish and all the things that happened to them through evolution. Snakes took an extreme approach and dropped all four, focusing efforts on hyper deadly jaws. T-rex kept that back but didn't use the front much... maybe in another 100 million years they would have disappeared completely. Whales grew a tale and let the back legs go to nothing while making the front into flippers... consider that the front legs were fins to start with on the fish... so full circle. Birds kept the reptile back legs and modified the front into wings... then penguins made the wings into flippers. After a long stint of being a land mammal on all four, humans stood up and freed front legs to be hands. The human hand is pretty amazing. I don't know of any other animal with such an advanced manipulator... evolved specifically for building and using tools. Dexterity must have been extremely important to survival to evolve to such a level. And of course, anything that is extemely important to survival will be extremely important in terms of sexual attraction. That, my friends, is why humans do so much with their hands when they are making out. It's little test, in realtime, answering a question about what one can do with one's hands.