The construction workers are drilling on the street, a round-faced Mao is glaring down at us from a photo above the bed, we are kissing and engaging in what the health instructor used to call heavy petting and all of a sudden something happens. This something goes on for about 27 blissful seconds.

"Wow," K. says. "Was that --"

"Yes."

"But we haven't even --"

"I know."

"Can we still --"

"Of course."

To be honest, I've never been a big fan of the multiple orgasm. Once I'm finished, I'm finished, and I'm ready to move on. How much pleasure can one girl take? This, at least, has always been my philosophy. But not today. Today I'm ready for more. "Get out of these," I say, fumbling with K.'s boxers. He happily complies.

We have just gotten into position when it occurs to me that this would be a good time to consult the pregnant woman's bible, "What to Expect When You're Expecting."

"Wait," I say, climbing out of bed.

"What are you doing?"

I unzip the outside pocket of my messenger bag. "Pregnant sex is different, you know. There are rules."

I bring the book back to bed, check the index under sex, positions for, turn to Page 238, and read aloud. "Side-lying positions are often most comfortable ... Ditto woman on top ... Rear entry can work well, too."

"Interesting," K. says. "Which position would you prefer?"

I check my watch. "The movie doesn't start until 7:30. Why don't we try all of them?"

It isn't necessary here to go into details. Suffice it to say that we do, indeed, try every one of the recommended positions, and every one leads to orgasm. I'm not talking mini-orgasms. Each one is full and lengthy, shaking me to my very bones. By the time we're finished I feel warm and fluid, as if my entire body has melted into the sheets. K. is very patient about the entire thing, although he does seem a bit stunned and exhausted.

"OK," I say, once we've moved on to position three and I have had my multiple fun, "your turn."

Afterward, we lie panting in the big white bed. Outside our window, New York goes about its business, unaware of the phenomenal sex that has just occurred on the seventh floor of the Library Hotel.

"Do you think that had something to do with the prenatal vitamins?" K. asks after we've both caught our breath, "or are you just happy to see me?"

"There must be a scientific explanation."

I consult the book again -- sex, interest in. I flip to Page 234, to the subhead "The Engorgement of Genitals." "It says here that 'increased blood flow to the pelvic area, caused by hormonal changes of pregnancy, can heighten sexual response in some women.'"

"And we've got how long to go?"

"Seven months."

"Seven," he repeats, a bit sheepishly.

I can't read his tone. Is that excitement I hear, or terror?

That night, we catch a movie at the Ziegfeld. It's "The Alamo," starring Billy Bob Thornton. It's an abominable movie with no plot or characterization, and very little acting, but there is at least one amusing moment when Billy Bob postpones a bloody attack by standing on the fortress wall and playing the fiddle for the enemy. During the movie, my mind wanders, as it so often does these days.

I begin to think about pregnancy sex, and to wonder why no one ever told me how amazing it could be. Is this a secret women keep because it is too dangerous for public knowledge? Do they fear that otherwise-intelligent, career-minded young ladies would be rushing headlong into pregnancy if they knew the truth? Or is the deafening silence on this issue motivated by more selfish reasons? Is it possible that women are simply stingy with the Multiple O?

I am here to break the silence, to shout it to the world. Pregnancy sex makes any other sex you've ever had seem like a trip to the dentist. Pregnancy sex is enough to make a nymphomaniac blush. You won't need any fancy props, no lacy lingerie or mood music. Just you and a partner in the sack, preferably the one who got you pregnant in the first place.

Another bit of wisdom: enjoy it while it lasts, because every pleasure has its price. Once your 40 weeks of prenatal lust have passed and you have seven pounds of baby flesh clutching at your breast, it may be a very, very long time before your next trip to the magical land of O.

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