The internet is full of many unfortunate urls that can be read in two ways. Some of the urls intentionally have double meanings, some don't. For instance, viagrafix.com (via grafix / viagra fix) was an unintentional oversight, but powergenitalia.com (powergen italia / power genitalia) was a deliberate joke, as is penisland.net. Apparently Vietnamese sites are prone to the same problem. For which reason, Vietnamese regulators have rejected the website name www.buoi.com.vn. The BBC explains:

A website hoping to promote grapefruit in Vietnam has been banned from using the fruit's name because of official fears of a mix-up with a penis.
The Vietnamese for grapefruit, buoi, sounds different from a slang word for penis, but without special accents it looks the same. Vietnamese regulations say website names cannot include "sensitive" words. The site, set up to market a grapefruit wholesaler in Ha Tinh province, was told to find another name. "We have to refuse the website name of www.buoi.com.vn because the word for grapefruit, buoi, without a proper tone marking can be misunderstood," Thai Huu Ly, of the Vietnam Internet Network Information Centre, told the AFP agency.