American biologists Craig Bartle and Alfred Charles Kinsey reported that fewer than 1% of males can successfully orally contact their own penis and that only 2 or 3 men in a thousand could perform a full autofellatio.
美國生物學家克雷格·巴特爾（Craig Bartle）和阿爾弗萊德·金赛称，不到1%的男性可以成功地用口接觸自己的陰莖，在一千人中只有2或3名男性能夠完全自我吮陽。