I agree if someone goes about this approach and is respectful of everyone along the way it's not necessarily dehumanizing and there's nothing wrong with it, but regardless it may feel dehumanizing to the person to find out about since that's more about recognizing and optimizing patterns, and less about their individual uniqueness.

For most people it's not really that extreme and to some extent this has to be allowed for. That's the tricky part especially with sex, you want someone who is good at it, but that typically comes with experience. That may make some people uncomfortable. Find a good balance and just call it what it is, young people living life. But it's also a good warning to not "over optimize" and spend all your time going down that route because then some people would rightfully question that kind of behavior. I know I don't want a partner with thousands of sexcapades.