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 wasyou 

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