Sex is less important than friendship in maintaining a happy relationship.

It is very hard to determine the sex of some birds.

Sex has always been used to sell movies.

Sex education is required at most American schools.

The veterinarian sexed the chicks and divided them into males and females.

The newspaper sexed up the story in order to make it more interesting for their readers.

Here are some tips on how to sex a woman up.

According to the survey, half of all men and women have attempted anal sex.

Did you live in a coed dorm in college?

The school Valerie went to was coeducational, but she is a teacher at an all-girls' school.

It's a myth that the fair sex aren't as cool-headed as men.

Having sex is an important component of marriage.

Dan and Ben finally had sex.

His wife threw him out because he had sex with the neighbor.

My husband and I argue quite a lot, but the make-up sex is so great it makes it worthwhile!

Roberta plays on a mixed-sex football team.

John does not understand how to speak to the opposite sex.

Mary was performing oral sex on her boyfriend.

Bill was performing oral sex on his girlfriend.

Wendy caught her husband having phone sex with another woman.

I don't believe in premarital sex: I'm going to wait till I'm married.

It's important to make sure you're practising safe sex.

Same-sex marriage is such a contested issue everywhere.

They were arrested for performing a sex act in public!

That actor still has sex appeal, even in his seventies.

In females, the sex chromosomes are the two X chromosomes.

The man was convicted of a sex crime.

The company has a policy to prevent sex discrimination at work.

After his surgery he had little sex drive.

Jayne Mansfield was one of the biggest sex goddesses of the 1950s.

Oestrogen is the primary female sex hormone.

The actress doesn't consider herself to be a sex kitten.

I'm sick and tired of you treating me like some kind of sex object.

All American states keep a register of sex offenders.

Elephants have very large sex organs.

A sex surrogate treats patients with sexual difficulties through talk, touching, and intercourse.

Raquel Welch was a sex symbol in the 1960s.

Sex toys are becoming increasingly popular.

The film is about the adventures of a group of sex-crazed teenagers.

The actor plays the role of a sex-mad old man.

Dozens of sex-starved sailors had returned to the port and were enjoying themselves in the nightclubs and bars..

Jacobs is facing a charge of sexual abuse.

There are pros and cons to single-sex education.