I don't know though man for me it's almost opposite to guys saying their wives shut them off. It's more that whatever girl I have dated, after I bang them a few times I just lose interest. Don't know how normal that is.
Plus with marriage you stay with one person for life (in theory). I love my wife but when she's 50 am I supposed to be still attracted to her? As I get older I don't find myself attracted to older women. I'm still most attracted to girls in their early 20s. That doesn't mean I'm going to sleaze after young girls, it's just the reality.
"That's what I love about high school girls. I get older, they stay the same age."