Definition of sex

[keegho]

Anyone here can give us a good definition of sexuality. Maybe this is more understandable. This is what i found it dictionary.com
1. The condition of being characterized and distinguished by sex.
2.Concern with or interest in sexual activity.
3.Sexual character or potency.
And i had another question. How many inches inside is the hymen found in the vagina? 2 to 3 inches maybe? Or more?

[COAD]

sex (sks)
n.

The property or quality by which organisms are classified as female or male on the basis of their reproductive organs and functions.
Either of the two divisions, designated female and male, of this classification.
Females or males considered as a group.
The condition or character of being female or male; the physiological, functional, and psychological differences that distinguish the female and the male. See Usage Note at gender.
The sexual urge or instinct as it manifests itself in behavior.
Sexual intercourse.
The genitals.

tr.v. sexed, sex·ing, sex·es
To determine the sex of (an organism).
Slang.
To arouse sexually. Often used with up.
To increase the appeal or attractiveness of. Often used with up.

[ALovelyLady86]

I already made a post like this... Sex Vs Making Love...

[keegho]

I already made a post like this... Sex Vs Making Love...

Yes i know but what i want is a definition.For example: Testability: The effort required testing a program to ensure that it performs its intended function.
This is something in my career as a software engineer. So what is the definition of Sexuality. This is what i am asking about. A definiton from everyone with his own words.