We definitely get kinkier, when we're younger we embark on our sex life and our boundaries are set at a certain level, we hit those boundaries and they expand. Sexual behaviour tends to escalate, when you've done something thousands of times you naturally want to try something you haven't tried, and after you've tried most 'mainstream' things you have to start filthing it up a bit. If my 19 year old self knew what my 48 year old self found appealing she'd think I was a huge pervert.