Smells like gas in the oil.

I was changing the oil on my 90' bonneville se. I notice that the oil was thin and smells of gas. What would cause this to happen. The car runs fine. there are no weird sounds coming from the engine. the oil pressure gauge is lower than normal. besides that it seem normal.

I was told that could be bad rings. the engine has 110k miles on it. it has never been run hard. i pulled the plugs to see what they look like. to find they are normal no oil on them. but if it was bad rings wouldnt there be oil burn? another person said the low oil pressure cuold be from blockage and i should have a flush done. if any has an idea the help would help alot. thanks:)