"Any pressure I've had to lose weight or whatnot has come from me. All female partners have said that they don't care about my weight, and some actually like some belly to rest on."

Same.

I work out as a hobby and for psychological hygeine, i.e. to keep myself disciplined and just feel better.

Oddly when I started dating my current girlfriend she thought my lack of a 'dad-bod' might be too much of a red flag.

Doesn't seem to be the case almost 5 months later.

¯\_(ツ)_/¯