system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did enormous dinosaurs have sex?
gpt
There just isn't much available evidence to suggest a concrete answer. Paleontologists have spent a lot of time thinking about it, but there just isn't evidence.

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Educated guesswork here; with their enormous penises, just like enormous elephants do. Most likely in the same position, "doggy style", too. It's a pretty popular position for animals. 

It's either that or a "cloacal kiss". Since birds are the most closely related living ancestor, some dinosaurs might have had a cloaca instead of the more familiar mammalian penis/vagina/anus combo. Some bi rds today do what's called a "cloacal kiss", where the male of the species squirts semen out of their cloaca and just splatters the female's cloaca with it.