I never wanted to be the person who said, "I woulda, coulda, shoulda. " Life is way too short, and you may not last that long.
The basic paradox about sex is that it always seems to be offering more than it can deliver. A glimpse of a girl undressing through a lighted bedroom window induces a vision of ecstatic delight, but in the actual process of persuading the girl into bed, the vision somehow evaporates.