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

Loves 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

Loves 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

Loves 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

Loves 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

Loves 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