A person's sex also seems to have some role in the development of autoimmunity.

The sex of the child also seems to have an effect.

Why do sex and passion seem to fade in a marriage, even when two people love each other?

But I've talked, as you know, to so many women, and sex seems to be a wholly other experience.

Saving sex for marriage might not seem to be such a radical concept.

"With all the past relationships I had, sex always seemed to be, in the end, this big focus," he said.

"I wanted to explore the way that sex and the idea of love seem like such ultimate issues in people's lives," he said.

At first glance, sex seems like mostly a physical matter.

Their sex seemed always such a celebration of how they matched each other in life.

Female sex seems to be positively associated with development of Alzheimer's disease before age 65 years.