When cuddling leads to consensual outer-course and may also from that point lead to full on intercourse. Many times the positions of the two people performing a cuddlefox barely change from the original cuddling positions.
Can also describe a person who is very talented at cuddlefoxxing, that is, can seamlessly transition from cuddling to outer-course
Jennifer: I bet all you and Richard did yesterday was cuddle all night in front of the T.V. How cute!!
Becky: Nah..it was more of a cuddlefox really....
Tom: I know Becky didn't put out, she ain't that kinda girl!
Richard: I'd say 'I know what you mean,' but that girl's one hell of a cuddlefox..