Definition: Sex in group or orgiy is a sexual behaviour which includes two or more women or men at the same time. In this WAP site, we refer only to group sex between men and women, even though it is also a possible sexual behaviour of some animals, like bonobos or bighorn sheeps.
All sexual behaviours carried by a couple can be part of group sex or an orgy, as well as other kinds only possible when there are more than two persons, either they're men or women. A type of group sex where a woman is fucked repeadly by several men is often refered as gang bang.
When having group sex, the same precautions adopted when having couple sex must be followed. Of course, those performing group sex may have a higher number of sexual partners and, for this reason, have higher chances of contracting sexually transmitted diseases by the anus, vagina and mouth.
Group sex can be performed between people of any sexual orientations (men, women, gay people, lesbians or bisexuals) and it can be also performed with groups of mature, old or young women.
In the following link you can watch free orgies videos.