What two philosophers were married but would invite others into their sex life?

I am not 100% percent on this but i heard their was a couple that were philosophers maybe during the time of WWII that were Russian that were kind of into the swinging of things.

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).