Lay Brahmacharya
For householders, brahmacharya means marital fidelity and moderation.
Laypeople practice brahmacharya through marital fidelity, moderation even within marriage, and avoiding improper sexual behavior. It includes mental fidelity - not desiring others.
Be faithful in marriage; let your heart wander not.
Lay brahmacharya adapts the vow to householder life.
Householder Vows