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Inter-species sexual behavior has also been observed in sea lions. Male grasshoppers of the species Tetrix ceperoi often mount other species of either sex and...

sexual behaviour, bisexual sexual behaviour, cross-species sex, sexual arousal from objects or places, sex with dead animals, etc.). When animal sexual...

common sexes and a few less common intersex variations. In some species, there are hermaphrodites. There are also some species in which only one sex is present...

Various non-human animal species exhibit behavior that can be interpreted as homosexual or bisexual, often referred to as same-sex sexual behavior (SSSB)...

and starring Ben Cross, Helena Mattsson, Dominic Keating and Marlene Favela. It is a stand-alone sequel and the only film of the Species series that does...

gamete evolution remains unknown. In species that have males and females, sex-determination may be based on either sex chromosomes, or environmental conditions...

heterogametic sex (or digametic sex) is the sex of a species where an individual's gametes have non-matching sex chromosomes. In humans, the heterogametic sex is...

engage in anal sex said they practiced it once a month or a few times a year. The prevalence of sexual intercourse has been compared cross-culturally. In...

people. Sex generally refers to an organism's biological sex, while gender usually refers to either social roles typically associated with the sex of a person...

Same-sex marriage, also known as gay marriage, is the marriage of two people of the same legal sex. As of 2024,[update] marriage between same-sex couples...

explanations for how a vast array of different living species maintain sexual reproduction. The concept of sex includes two fundamental phenomena: the sexual...

The missionary position or man-on-top position is a sex position in which, generally, a woman lies on her back and spreads her legs and a man lies on...

Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans. These differences...

attraction, romantic attraction, or sexual behavior between members of the same sex or gender. As a sexual orientation, homosexuality is "an enduring pattern...

Kingdom was the country with the most sex partners with an average of 7, while Austria had around 6.5. The 2012 Trojan Sex Life Survey found that African American...

anisogamous species, the two sexes are referred to as male (producing sperm or microspores) and female (producing ova or megaspores). In isogamous species, the...

Sex differences in psychology are differences in the mental functions and behaviors of the sexes and are due to a complex interplay of biological, developmental...

can have the organs of both sexes. However, individuals of most species remain of one sex their entire lives. A few species of insects and crustaceans...

Man, and Selection in Relation to Sex (1871). Natural selection was expected to work very slowly in forming new species, but given the effectiveness of...

are F1 hybrids between horses (mares) and donkeys (jacks); the opposite sex cross results in hinnies.[citation needed] However, such offspring are almost...