Its goal is to "take the guesswork out of dating" for single women.
When men sign up for the site, they have to admit their size and whether or not they're circumcised.
It was launched by the same man who launched SugarDaddie.com, Steven Pasternack.
The description of the site says that it is helping women get what they "really want."
"Looks, humor and intelligence are just an example of what initially draws us to another person. But if we are really truthful, there are other reasons. We are all attracted and drawn to size, the most common examples of greater size would be in reference to a woman's breasts or a man's manhood," the site reads.
"We separate the men from the boys. In our quest to make the ultimate well endowed dating site, we have found that most people want a quality relationship that is based upon looks, intelligence, sense of humor and morals to name a few. These are all fine qualities to look for in a companion, but let's face it, you want to know that you're not wasting your time and effort with someone, only to find out later on that they are not up to your standards physically."
Since the site likely wants to comply with anti-discrimination laws, they also offer membership to women looking for women and men looking for men. But all men on the site must be "larger than 7 inches."
Penis size has been making headlines lately after a study revealed that size seems to matter to women, as they rated taller men with larger penises as more attractive.