That's not true...oral sex is depicted graphically all the way back to ancient Egypt going back thousands of years BC, and they even have a story about a god who lost his penis and it was fixed by another god sucking on it.
And obviously the Kamasutra depicts it and virtually every other sex act you could think of and was written in the 2nd century.
I mean come on bro...you really think women have seen long hard c0cks for thousands of years and only in the last 100 they have thought to themselves, "Wow, I wonder how that would feel in my mouth?"
That's just silliness.
Oral sex has come a long way.