Is being incompatible physically a legitimate reason to breakup?

My boyfriend is really great and I love him, but I don’t know if I can stay with him. I’m tiny, a little under five feet tall and under 100lbs. He’s huge, like 6’6” and probably 300lbs. He’s also really big down there, like much bigger than other guys I’ve been with. Normally in relationships I’m the one that wants sex more but he wants it all the time. Like ten times a day.

Is there anything I can do?

Is being incompatible physically a legitimate reason to breakup?
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