19,000+ worksheets, make your own worksheets and awards, games, and software,

For years mothers have told their teens that horizontal stripes do the female figure no favours and that vertical ones are more flattering.

Horizontal definition, at right angles to the vertical; parallel to level ground. See more.

Why Do Men’s Bike Frames Have the Top Crossbar Horizontal, But Women’s are Slanted?

Get Male Sex Organs pictures and royalty-free images from iStock. Find high-quality stock photos that you won’t find anywhere else.

One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process. Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.

Test your knowledge with amazing and interesting facts, trivia, quizzes, and brain teaser games on MentalFloss.com.

Hdefinition by Dictionary of sex terms and “F” word, contains sex terms, definitions, synonyms, and quotations

Find out if having sex in certain positions or lying down after sex can improve your chances of conceiving.

Horizontal gene transfer (HGT) or lateral gene transfer (LGT) is the movement of genetic material between unicellular and/or multicellular organisms other than by the (“vertical”) transmission of DNA from parent to offspring.