Lesbians being appealing to men is not an accurate statement. While some men get turned on seeing "girl on girl action", others will be quick to be abusive and insulting, homophobic etc. (A scene from Family Guy springs to mind!)
As for gays being unattractive, same principle. It's all relative. While Elton John may be considered unattractive, John Barrowman may be considered anything but.
It's like saying chocolate is so amazing, when there a so many brands, types, flavours, etc, all different. Everyone is different and everything is relative. More or less. Sort of.