Now, I think there is a FINE line between Ruining a Woman, and Spoiling her.
If a woman had sex with a well endowed male (9 inches), and found it amazing (felt good, had multiple orgasms etc), she would be spoiled. Why spoiled? Not every man can acheive this. The female may feel that she had amazing sex because of the endowment.
OK, now, take the same woman.. and give her a bf who is 5 inches. Sex with him is good, but it doesn't feel the same because she remembers the feeling of the 9 inch dick, buried inside her. Now she is Ruined.
See the difference?