Pynchon is too much with you. Fate or choice?

[Mark Kohut]

So, Oedipa makes the sex bet with Metzger that
"my daddy, my doggie and me" [Metzger's character]
will not, as movie, have an ending where they survive.

Metzger, although knowing the ending, takes the bet.

Although the reels get mixed up, and Oedipa is heavily
enwrapped, she does allow---falls/"rushes submissively toward"--
sex.

Metzger knew the outcome. But he wanted her. And he got her
despite she was on the no-sex part of the bet.

Sex was fated/inevitable or the result is not foreknown?. "Pierce
said you would not be easy"

Why, this reading, am i somehow reminded of Slothrop trying
to determine whether his penis is not his own or "free'?
Is Oedipa's body free or 'not her own" within this part of the text?
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Pynchon-l / http://www.waste.org/mail/?list=pynchon-l