Coitus

[Tina]

fancy way to say fuck

[Justin Bieber]

physical union of male and female genitalia accompanied by rhythmic movements usually leading to the ejaculation of semen from the penis into the female reproductive tract

[Justin Bieber]

The way a child with a speech impediment pronounces Curtis. Hilarious when heard aloud.

[Mark Zuckerberg]

What Sheldon Cooper says instead of sex

[Couch Potatoe]

The absolute least sexy thing to shout out in bed.

[Rihanna]

1. Sex
2. Formal terminology often used by the super intelligent to describe the love-making process, every little boys dream

[PussyCat]

A sexual act between male and female in which the penis is inserted into the vagina, or as Stewie Griffin would say:

Inert your pen-is (pen as in for writing, fallowed by is) into her vag-in-a (like Badge with a V fallowed by the two words in and a)

[Sonia]

Sex. The physical act of love.

[Justin Bieber]

A sciency-sounding word for SECKSSS. Sheldon Cooper from the show The Big Bang Theory often replaces the word sex with coitus.

[Tanya Shivari]

Scientific reference for doing the dirty, having a no pants dance, or advancing courtship. Coitus is commonly used in a popular TV show, The Big Bang Theory.

[Julene]

Sexual intercourse.

[Merna]

Another word for [sexual intercourse]. More frequently used with other [animals] than with [humans].