Some-sex marriage 

A marriage where a couple participates in minimal sexual activity.

“Bill and Wanda’s sex life was almost non-existent. They had a some-sex marriage.”

Some-sex marriage by MoLo36 June 30, 2009

Some-sex marriage 

A marriage where sex is almost non-existent. According to many sex therapists, sex between married partners less than 12 times a year is considered a sexless marriage. This is a some-sex marriage.

Jill took pity on John and had sex once a month. They had a "some-sex marriage".

Some-sex marriage by Glen Allen March 23, 2011