Alloseros 

Allos is a Greek adjective for other and Eros is the Greek god of pleasure. Alloseros is sexual pleasure derived from one giving another person sexual pleasure.

“I had a great moment of alloseros going down on my wife.”

Alloseros by Dr Eros August 29, 2021

allosexism 

belief or assumption that being allosexual is the only way to be, or best way to be

It's allosexism to believe that asexuals are just "broken."

allosexism by JustToBeQueer May 9, 2015

Allososiaphilia 

The erotic desire to have sexual relations with two people who are perfect duplicates of each other. Different from an attraction towards twin siblings.

"Would you have a threesome with me and an identical clone of myself?"
"Yes, in fact I have Allososiaphilia!"

Allososiaphilia by thankyouyuri February 28, 2023