Bondage

Sexual gratification in being restrained or restricted, or restraining or restricting.

Cock and ball torture

The desire to have pain inflicted on a penis or testicles. 

Pregnancy

Being aroused by pregnancy. 

Role play

Pretending to be someone (or something) else.

Cuckolding 

When someone enjoys watching their partner have sex with other people. 

Dominance 

Having control over a partner during sex. 

Voyeurism 

Gaining sexual gratification from watching other people engage in sex.

Age play 

Being turned on by, and playing out age differences. 

Wax play

Wax play involves dripping wax onto your partner, or having it dripped onto you. 

Erotic asphyxiation

Controlling the flow of oxygen. 

Foot fetish 

Self explanatory. Kinda vanilla. 

Tentacles

The desire to have tentacles or creatures that have tentacles penetrate or otherwise in engage in sexual activity. 

Urethral sounding 

Inserting metal rods into the urethra.

Hentai

Japanese art depicting sex. 

Impact play

Sex involving whips, paddles and other things might leave a mark.  

Knismolagnia

AKA a tickling fetish.   

Lactation 

Being aroused by breastmilk.

Masochism 

Gaining sexual pleasure from pain. 

Sensation play

Playing with and stimulating the sense: hearing, taste, touch, sight and smell.