Dirty

Used to with my ex which was the hottest thing ever. Cause it always involved talking about super dirty and crazy stuff we would never try in real life. Like threesomes and other things. She lived like 3 hours away and after we broke up we didnt see each other much but we kept the phone sex thing going on until we both started seeing other people.

There's no way it'd even be worth it to call a random person though, like one of those sex hotlines or whatever.