But it doesn't sound like you're offended or scandalized
so I wouldn't call you a religious fanatic or a sexually repressed individual.
You're probably having the perfectly normal, adult reaction of your subconscious sexual feelings and thoughts triggering the conscious associations in your mind - you see the fruits fu##ing.
However, a normal, healthy, well-adjusted child, as well as many adults, will NOT make those associations (despite what Freud said) and adults who worry so much that they will are probably just messed up themselves, in my view.