People like sex. Most people. Your parents likely had sex to make you.
Why do people make this weird. If anything, if your parents are having great sex, you likely have a stable happy household. People should be happy for their parents if this were the case. Good for them.
It’s a bit weird the first time it really hits you.
My moment was when we were a bit early for a holiday dinner and my mom was trying to prepare a turkey, but was having trouble stuffing it because it hadn’t thawed completely. She made a comment about the legs being a bit stiff and hard to spread, and my father said ‘Give it a margarita.’ (my mom’s favourite drink).