What's the Name of That Book??? discussion

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The Man Who Folded Himself
SOLVED: Adult Fiction
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SOLVED. scifi: novel: time-traveler, uses belt device
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To elaborate, "the Man Who Folded Himself" has every element that Justanotherbibliophile mentioned. The hero was named Danny, he received the belt from "Uncle Jim,". The female version was Dianne.
Books mentioned in this topic
The Man Who Folded Himself (other topics)The Star Diaries (other topics)
Tales Of Pirx The Pilot (other topics)
The Man Who Folded Himself (other topics)
So, all of these recent TT posts have got me thinking, and I've realized there are a couple of books that I don't know any of the identifying information for:
This is a time-travel story, guy gets a belt (technology so advanced it is magic) that allows him to travel through time. He goes forward and back, but not too far forward since he doesn't fit into society very well (they all get taller, and he thus gets comparatively shorter and more distinctive), and back (to dinosaurs once?), sees Jesus go up on the cross, teaches himself things, sets up break points - where he can interrupt himself from doing actions when he starts messing around changing the past (saving influential people, etc, etc to see how things turn out). I think he plays the ponies originally, and 'wins' a bunch of money.
Sex and (view spoiler)[
he gets into real-masturbation; ie: gay sex with future and past selves.
He eventually bumps into a female version of him (and *that* is never explained either), who he knocks up. They eventually go into a biomedical arms war (one of the few times he goes into the future) attempting to set the gender of the child. Turns out they both end up with one of their own gender (different timelines?) and break it off after taking the child, obviously this goes to snake-eats-its-own-tail for where he comes from.
(hide spoiler)]
Where the original device came from is never explained (IIRC).
He gets bunches of the time-travel devices by looping himself a bunch of times and taking the belts (I don't think he ever explains what happens to those versions of himself?)