Definition - What does Submissive (Sub) mean?
A submissive (sub) is a sexual participant who willingly gives up some or all control to a dominant partner. This type of partnership is often referred to in the BDSM community as a dominant/submissive (D/s) partnership.
A submissive might also be called a "bottom" while the dominant partner might be called a "top."
Kinkly explains Submissive (Sub)
There are varying degrees of D/s relationships. Some men and women only play at being submissive during certain times, such as during sex or when in a BDSM club. Others may live as full-time submissive and relinquishes control to their Dominants in all aspects of their lives.