sexiverse 

The universe of sex, made popular by the Twilight fanfiction "If Every Word I Said Could Make You Laugh" by carmeliagunn.

Emmett complained that the sexiverse was out of balance after Rosalie declared a vow of chastity before their wedding.

sexiverse by The Lion And The Lamb July 27, 2009

semiversary 

6 month aniversary.

A shortened version of the word semianniversary.

On the inside of a card:
Happy semiversary

semiversary by KoH March 20, 2007

sexierest

The most sexy one can be at anytime.

Chris is the sexierest man on the planet.

sexierest by bingo_was_his_namo July 20, 2009

Sexiversary 

The date on which two people first had sex.

He was invited out for a drink after work, but he knew that since it was their sexiversary and she would be expecting him to be on his game, he declined.

Sexiversary by Kate Charlton June 18, 2008

Sextversation 

An adult conversation or exchange taking place exclusively through text or instant messaging.
Typically starts off benign and then turns sharply to the gutter as time goes on.

My texts with Tracy were friendly at first but after a few days we became aware of a mutual attraction and our communication evolved into hot sextversation...

Sextversation by Brewton September 22, 2014

Sexversations 

Communication, dialogue, discussion, or conversation that promotes personal sharing, inquiries and critical thinking around all things sexual. Healthy sexversations are framed around safer sex practices, consent and empowerment.

Frequent sexversations increases your sexual IQ.

Sexversations help break through societal myths and taboos.

Sexversations by Sexpert at In Our Own Voices June 25, 2013

Sexiversary 

The date on which two people first had sex.

He was invited out for a drink after work, but he knew that since it was their sexiversary and she would be expecting him to be on his game, he declined.

Sexiversary by Kate Charlton June 19, 2008