Here's a list of some of the terms that work well:

anus

blowjob

boudoir

condoms

deepthroat

braless

cowgirl position

cum

cunnilingus (be specific and maybe put kissing in the negative prompt)

deepthroat

dildo

doggystyle position

fingering

hand in panties

handjob

hitachi magic wand

implied blowjob

ipcam / nightvision ipcam

masturbating (might want to put penis in negative prompt, or specify what she's rubbing for women)

massage

missionary position

naked, nude, etc.

penis

pregnant (and can specify trimester)

prone position

reverse cowgirl position

sex

sheer

snapchat (and caption/text/etc)

selfie (and mirror selfie)

spooning position

strap-on dildo

tentacles

licking testicles

undressing

vagina

wet clothes

Depending on the version, the following might kind of work:

anal sex

anilingus

But also keep in mind that it was trained on stuff like "her panties are pulled down to her thighs," not "panty pull."

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