The doctor wasn't the sort to give up on the opposite sex for very long.

"And maybe next time, I won't run off the court at the first sign of the opposite sex."

In some cases, a member of the opposite sex must be present.

Want a child of the opposite sex from your own?

Many children want to go to camp with members of the opposite sex.

I have a good friend of the opposite sex who I've known for three years.

The book is for anyone, no matter their skin color, who has ever had a relationship with a member of the opposite sex.

He'd always been sure of his ground when it came to the opposite sex.

Then there was also the question of my relations with the opposite sex.

On good days, they love someone of the opposite sex and the same species.