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