I feel a bit bad for paedophiles in that they’re basically forced to have relationships with persons that they don’t find very sexually attractive, else they break the law.

I've seen a paper--which I unfortunately did not bookmark--that seemed to indicate that most pedophiles were not exclusively pedophiles; many are able to have romantic and sexual relationships with age-appropriate partners. They also tend to have a distinct gender preference for minors (e.g., a person that is a heterosexual and a pedophile will prefer minors that are in-line with their sexual orientation). The ones that are 'pure' pedophiles--not sexually attracted to any adults at all--do not seem to have a gender preference, which kinda makes sense when you consider secondary sex characteristics as markers of physical maturity, e.g., young boys and girls look physically very similar aside from the genitals themselves. Again - I don't have the reference on this saved, so I might be misremembering, or misrepresenting it, but this is what I recall.

there are exactly zero underage people who they can interact with at all sexually.

There's a genetic disorder--I believe exclusively in women--where they don't 'grow up'; they don't get very tall, they're largely lacking in secondary sexual characteristics, and I believe that they're infertile. I ran into a woman like that--who was with her partner--at a fetish event. It really gave me whiplash, because at first, second, and third glances she looked like she was 12, at an event that had explicit sexual activity in the open. It took a closer look at her face to realize that she was in her 30s. God bless her, she found someone that was attracted to her, and into the same shit she was into. So, y'know, there's that.