Outpersonals is one of the older and more populated "Find a fuck-buddy" websites.  Creating a profile is detailed and goes beyond the typical body type questions to details about the length of width of your cock, and whether you're circumcised or not. There are also a lot of other physical descriptors you can fill out, from eye color, to hair length, to glasses or contact.  The more details the better as you can then search by all these criteria to find your ideal lover.

In addition to all the physical attributes, you can search by what you want, like Discreet Relationship, 1-on-1 sex, Group Sex, Bondage and Discipline, Cross-Dressing, Exhibitionism & Voyeurism, Sadism & Masochism, and Other "Alternative" Activities (ballroom dancing?).  Once you've determined what you're looking for and what you want to do with them, you search by state or by zip code.  The results a user's ID pic and a few details, but to see their entire profile, you must join the minimum membership level (silver - $19.95).