Why don't I get butterflies in my stomach and as horny as a 22 year old? Why was I more lustful when I was younger?

Im 22 years old and still a virgin. I remember when I was like 17 or 18 and even younger I had an intense attraction to women and I blushed and got butterflies in my stomach and felt a sense of adrenaline when I was close to a very attractive woman.

I remember seeing a naked woman in person for the first time, which was at a beach when I went with my family. She was super hot and was putting sunscreen on herself and didn't have a bra. What I felt couldn't be truly described. I would have jumped in the ocean with scuba/diving gear and fought the biggest, meanest, shark to death with a harpoon if it meant getting to have sex with that beautiful woman.

Now, I don't have as much of a desire for sex and the opposite gender. I feel so jaded, bitter, and my erections are so weak. Not only that, but I feel like "simple/vanilla" stuff doesn't excite and arouse me as much. I need to see intense sexual stuff in crazy sexual situations. Like having sex with an attractive divorced female boss/manager, delivering pizza to a random orgy and being invited to join, step relative stuff, etc.

I truly miss the intense feelings I had before.