My HS girlfriend had only seen 3 dicks including mine. Once we got together late in our 12th grade year she gave me the second cherry in my 18 years. She was always telling me my 5.8 inch cock was so big, I am thicker than average but she must have had a bigger one after me. We were 20 when we split and she was married at 23, just after finishing college. I know she had at least 2 after me before getting married.
My wife had been with at least 3 guys before me, probably more. We were 23 when we met. We watched some vhs porn after we married in the early 80s, she commented that guys don’t have dicks that big only porn guys.
About a year later she had her first big one and said all she had been with were guys my size and I was noticeably thicker than them so she always thought I was pretty big.