Nub sex 

Sex between two virgins, or just plain awful sex. Stems from poor knowledge or experience in sexual situations. Akward and unpleasant, both parties are left disatisfied and sometimes depressed.

Caity will still be having nub sex at age 32.

Nub sex by Honest Justice May 30, 2006

Nub sex 

The act of intercourse between two amatuer "nubby" people

Yo did you hear about that nub sex john had with his girlfriend?

Nub sex by Matthew & Gary May 3, 2004