Pronatalism in Dirty Jokes

I have very...rambunctious students this year. Lots of immaturity combined with dirty jokes, and I am being tested in my ability to keep a straight face while cracking up inside. 

Today, I worked with three of my students while doing a lab on boiling point. I think they thought the tubing that ran from the test tube that boiled with the thermometer in the stopper to the empty test tube in cold water (for collecting condensation) looked somehow sexual. Which is strange as it didn't look remotely sexual. 

Anyway, they kept making veiled jokes about "D" this and "D" that, and I said, "okay, enough with the Ds. No more Ds."

And one of my spicier students muttered, "Well, then how did you get your kids?" 

I said "what?" and pretended not to have heard, and he said, "well don't you have kids?" I guess insinuating that I then needed a D to accomplish that and so could not ban the jokes about it without hypocrisy. 

"Oh, I don't have kids." 

He just stared at me. His mouth silently opened and closed a few times, but nothing came out. 

"Kinda takes the steam out of your joke, huh?" I said, laughed, and walked away. 

It made me laugh, in part because I think he thought he could shame me into being like, "yes, my children came from sex, sex with a D." But instead he ended up uncomfortable because I don't have kids, and so no "utilitarian" use for sex. With a "D,*." And I hid the fact that that made me cackle insanely inside, behind my straight face.

*In case you didn't figure it out, D = dick.

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