Why did The Dude go to the doctor?

In The Big Lebowski, Maude sends The Dude (or his Dudeness) to the doctor to check his jaw. The doctor asks him to take his pants off, and then he comes out of the exam with a grin on his face (although this could well be his general happiness).

We later learn that she's selected him to be the father of her child, but why did she send him to the doctor? It's implied it's related but if it was so he could be a donor why did she visit him in his apartment?

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Best Answer

She wanted him to be examined to make sure he was fertile and healthy to be the father of the child she wanted. It's possible that the exam could have included a virility exam, which would include a check for sperm count, which is usually done by examining a sperm sample. As such, The Dude may have masturbated during the exam to provide the sample, and his smile was from him feeling good or thinking, "Well, that was nifty, never had to do that in an exam before," as he left.

All of this is generally implied later after The Dude and Maude have sex and are talking in bed.

The Dude: "Oh, so that doctor, um . . ."

Maude: "Exactly."

I believe she visits him at his apartment to have sex because she's clearly shown to be a very sexual woman and wants to have her child as a product of sex, not artificial insemination or anything like that.