I got a letter just the other day
She sent a picture, but she didn´t sign her name
She wore high heels and a little black lace
I knew her body, but I couldn´t see her face
She didn´t leave a number, not an address or a clue
But something in that photograph reminded me of you
Baby, let´s put the X in sex
Love´s like a muscle and you make me wanna flex
Baby, let´s put the X in sex
Keep it undercover, baby let me be your private eye

I got a call in the middle of the night
Heavy breathin´ never sounded quite so nice
She said "Oh yeah, I wish that I was there"
I asked who was calling, but she wasn´t playing fair
Sometimes you gotta suffer for the pleasure that you seek
You´re beggin´ for an eyeful but you only get a peek

Baby, let´s put the X in sex
Love´s like a muscle and you make me wanna flex
Baby, let´s put the X in sex
Keep it undercover, baby let me be your private eye

I heard somebody knockin´ so I opened up the door
She wore a hat, shades, and a trench coat
Wasn´t wearin´ that much more
She said she knew my secrets but I didn´t have a clue
Then I saw those black lace panties and I knew that it was you

Baby, let´s put the X in sex
Love´s like a muscle and you make me wanna flex
Baby, let´s put the X in sex
Keep it undercover, baby let me be your private eye
Let´s put the X in sex
Love´s like a muscle and you make me wanna flex
Baby, let´s put the X in sex
Keep it undercover, baby let me be your private eye
Let´s put the X in sex
Love´s like a muscle and you make me wanna flex
Baby, let´s put the X in sex
Keep it undercover, baby let me be your private eye
Let´s put the X in sex
Love´s like a muscle and you make me wanna flex
Baby, let´s put the X in sex