*EDIT - A fellow creator made a good point in the comments t..

*EDIT - A fellow creator made a good point in the comments that there are other definitions that may suit this couple well. I updated this post to include those definitions, as well! Thanks for making such a great point, @pollythemilf !*

So basically Trevor and Terri are what is known as a hotwife/cuck couple or a stag/vixen couple - or probably more accurately, a combination of the two. There are other pieces of their journey that I haven't shared here that may make this distinction more clear, but for now here are the definitions of both types of relationships...

HOTWIFE: The female partner is encouraged by her partner to have sexual relations with other men. Her partner may or may not choose to be present. And he may or may not choose to be involved at some point in the sexual engagement.

CUCKOLD: A male who enjoys seeing his partner with other men or hearing about it afterward. He typically is ok with his wife having sex with other men whether or not he is present and whether or not he knows about it in advance. He may get turned on by his partner 'cheating' on him. (Although I use that term loosely, as there's always consent in cuck relationships...which makes it consensual cheating done with the intention of turning your partner on...which is quite different from traditional cheating!) He may prefer that the person she fucks is younger or has a larger cock. He may or may not enjoy being humiliated in the process.

VIXEN: Pretty darn similar to a hotwife. Some people refer to a vixen as the unmarried version of a hotwife although I've seen tons of married people define their relationship as a stag/vixen relationship.

STAG: A male who enjoys seeing his partner with other men. In some stag/vixen relationships, both partners encourage each others sexual exploration of others. The stag typically enjoys being present to enjoy his partner playing with other men. Most stags and vixens would still consider it cheating if the woman had unplanned sex with another man. The stag may or may not join in.

PS: I'll ask Terri and Trevor what definition they think most suits them if they had to choose one!