Complex sentence: In the fetish cuckolding subculture, the female is typically sexually dominant, while the man takes on a submissive role, only becoming involved with her or her lover when she permits it--sometimes remaining altogether celibate.
Split into simpler sentences: In the fetish cuckolding subculture, the female takes on the role of being sexually dominant, while the man takes on a submissive role. The man usually only becomes involved with the woman or her lover when she permits it--sometimes remaining altogether celibate.