"Fuck buddies" is the term I believe they use nowadays.

[You just had to ask, Otacon. Raikov's voice gets a bit huskier as he reminisces about a certain Colonel.]

A man that is powerful, possessive, handsome, dominating... A man that can make me aroused simply by his presence alone. To make me want to worship him...

[That sly expression fades for only a moment, perhaps showing a hint of sadness. He shakes his head slightly and recomposes himself.]