What this girl wants is to swallow.

Christina Aguilera called herself a “promoter of the swallow” in an NSFW oral sex confession on the “Call Her Daddy” podcast.

“Swallowing is really a good thing. … It’s got a lot of protein,” the “Dirrty” singer told listeners in Wednesday’s episode, adding that “there is something to be said [for doing so] after you put in the hard work.”

As Aguilera, 42, continued to give tips, she noted that it is “really important to be with a partner where you can really explore.”

She explained, “Sexuality is a very specific thing, so, like, what one guy might like, another one doesn’t.

“There are some guys that don’t like their balls being touched … and there are some guys that like brutal things happening to them. There [are] a lot of different levels.”

After sharing wild places she has had sex — the shower, a commercial flight “with blankets” and “bent over the soundboard” in a studio — Xtina spoke about losing her virginity “later than” most people would expect.

“I probably was the last person to lose my virginity,” she said. “It was something that was for me.”

Aguilera did not divulge any more details about the experience.

However, she said she was “close” with “certain dancers” while performing.

“You’re traveling a lot, and you have accessibility to only certain things,” the Playground co-founder recalled, saying she “didn’t really have time” to date fellow celebrities.

“My anxieties couldn’t maybe take somebody that did the exact same thing I did,” she explained. “I know how this goes. I’m too vulnerable.”

Aguilera briefly dated backup dancer Jorge Santos before meeting her ex-husband, producer Jordan Bratman, in 2002.

The former couple were married from 2005 to 2011 and co-parent 15-year-old son Max.

Aguilera began dating “Burlesque” production assistant Matthew Rutler in 2010, getting engaged four years later.

The duo share 8-year-old daughter Summer.