back in the mid 60 s i was a part of a program in collage. 10 girls all the same age blindfoled 10 men 20 through 65 each 5 years apart. for 10 weekends we would each have sex with one girl for two days. the girls would rate each one on preformance with a number system the prof had put together. each week a different girl. the blindfold was locked in place so the girl could not tell who or how old the man was. government grant paid each one and it was GOOD money. end results 8 of the 10 girls picked the 60n yo man as thebest lover. me at 25yo was number 7. i thought at the time it was wrong but now in my 60 s i know i am a better lover now. found out in 99 the girls were only 15yo. we could not see them very well in the very dark room. we were assured they were of age but the prof wanted young inexperanced girls to rate us.