Is it normal sexual things with my wife feels fake?

At first she was all about sex when we met. We'd have sex every single night, some during the day, even more than once a day. Over time, it's slacked so much that I feel decent when we have sex once a week or every two weeks. It's killing me. I'm a VERY sexual person who's into a TON of stuff. I'd even mix her cum with things to eat and drink. She's more so about just getting it done and over with, hates the mess, and always seems fake when she "tries" something. It's hard to get past for me.