because humans like sex.
Well there are always the casual sex websites. Or websites based on sex movies or over 18 movies. Why do want to know?
There are many swingers websites where you can find other couples to explore with.
none have sex with a friend
There are many public access websites, some put up by the government, that give this information.
Internet sex, or Cyber-sex, is a form of verbal sexual intercourse. Many chatrooms and websites are targeted at Internet sex, and those that enjoy it. It a nutshell, Internet sex involves two or more people discussing and imagining what they would do to each other sexually. It can involve anything real sex entails. Having Internet sex does not mean you are no longer a virgin.
http://www.3d-sexgames.com
KidsHealth , LiveStong , KeepKidsHealthy. Just get on google and search puberty and you will find a whole bunch of websites.
Transsexual escorts (or sex workers) in New Zealand, where sex work is decriminalised, can contact The New Zealand Prostitutes' Collective, which is the national sex workers' rights organisation. NZPC can advise which websites are available to advertise on, and which ones are free to use, etc. NZPC website is nzpc.org.nz
Adults looking for a anonymous alternative to the real thing. Between consenting adults cyber sex is the safest form of sex. Many websites have popped up to facilitate adults looking for cyber fun.. very popular is Sex contacts club who provide chat rooms and cams within there site for members to openly look for willing cyber partners.
type of websites
yes there are many websites for science