I write all sorts of things from naughty to major seriousness, I also proof technical articles/papers and that sort of thing. 8 books published under a pseudonym. One very serious book is just under way at the moment and that concerns my experiences as a carer of someone with Alzheimer's, the base of it being practical tips but co-mingled with the humour that comes along, not laughing at the person but at the condition.
I don't get it that often - I have a discipline that when I do write, I like to get 1500 words a day down and through first proofing. I'm lucky in that my Eds say I write reasonably clean.
To counter it, I step away and usually the brain works the know through, one of the tricks being to use my think tank, aka the bath, nice hot water and a submerge and just let the brain wander wherever. That has worked a number of times.
As to creative block, well, I jot down notes in Word on ideas or keep photographs that help inspire scenarios.
Male and old enough.