Complex sentence: Homoflexible is used to describe people who are primarily gay or lesbian but they may engage in an opposite-sex relationship in their lifetime or that they are currently in an opposite-sex relationship which is a rare or unique experience for them.
Split into simpler sentences: Homoflexible is used to describe people who are primarily gay or lesbian but they may occasionally engage in opposite-sex relationships. Alternatively, they may currently be in an opposite-sex relationship which is a rare or unique experience for them.