"Making out" issue

Kinda sexual warning haha

4 years ago my wife and I first started fooling around when we were just friends and we made out all the time with no issues.

We still have an extremely active sex life but whenever we kiss, sometimes I'll kiss a little more and even kiss down her jawline to her neck, and she'll pull away and say "go away" with a shy smile.

Even when we're getting having sex, she'll still get shy and even giggle cause its ticklish. This never happened before we settled down.

What do you guys think and did this start happening too when you finally settled down?