I realized I don't really get "butterflies" anymore?

i used to experience the "butterflies" feeling around girls I had a big crush in middle school and high school. also just the excitement and anticipation of the girls I like. well I am 23 now and I realized I don't feel like that anymore.

i don't feel strong crushes anymore...i see pretty girls all the time and I want to have sex with them, but not so much the butterflies feeling. then again I haven't been on a date with a girl I find really attractive in a long time. I just hook up when I get the chance to (one night stands at bars mostly).

is this normal?
I realized I don't really get "butterflies" anymore?
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