Loss of interest

So (30M) took a girl(28F) who I felt I had an interest(texted, lots of interesting things to talk about) out on a date for a hike. After realizing that she just wanted to have fun, I lost interest. Every experience ive had with having sex on the first date (which could’ve happened in this one but didn’t) always lead to a relationship that died off. I feel that every time I have sex with someone on the first date, she gave me everything she’s had to offer, and to me its just I feel there’s no chase, no momentum to build on, too easy (not sure but I like a chase because it gets me even more interested), or eventually although the oxytocin got me at first, when I get to know the girl, I realize that we are incompatible and just stuck on each other sexually. I just feel its always better to get to know them before the sex (I know I can be a sexual deviant and they will get that from me) because it makes the sex better (Being genuinely into someone makes me even more sexually attracted to them..) Going through reddit post, it seems like several on r/dating would rather have sex on the first date, then build momentum later. Not sure if thats a millennial or get Z way of thinking. At 30, I feel that I am more about trying to establish a ‘genuine’ long relationship and done with the one night stands and hookups. So would you rather prefer to have sex on the first date or wait to get to know someone first before getting intimate?