Basically, a threesome (when three people have sex). It probably means 2 dudes 1 girl, but it can mean the opposite too
A sex-linked trait is a trait governed by genes on only one of the two sex chromosomes.
A male has two sex chromosomes, one X and one Y.
The two human sex chromosomes are called X and Y. Females carry two X chromosomes, and males carry one X and one Y.
Two women and one man.
one sex (bacteria) & two sex (us).
Sex has two definitions. One - a type of gender, for example she is the sex of female Two - the process of making a child. Google the number two. Google sexual intercourse - how does it work? and your questions will be answered.
The X chromosome belongs to both males and females. However, females have two of the same kind of sex chromosome(XX), and are called the homogametic sex. Males have two distinct sex chromosomes (XY), and are called the hetrogametic sex.
A female human has two X sex chromosomes in her cells. A male human has one X and one Y sex chromosome in his cells.
There is the kind where two people of the same sex get married, and then, that's about it. There is only one kind of same-sex marriage.
Humans have two sex chromosomes, the X and the Y. Human females have two X sex chromosomes and are said to be XX. Human males have one X and one Y chromosome and are said to be XY.
Two boys and one girl.
Twice as likely as having sex with one man. Anytime you have unprotected sex you run the risk of catching something. One, two, or fifteen, each encounter runs the same risk.