Hey, I have some pretty bad IBS. It has never been confirmed really but my IBS was uncovered / made a lot worse by MtF hormone therapy. I had always had occasional constipation and diarrhoea but after starting hormones, I had a whole lot of issues to worry about suddenly, like cramps, what I eat in the morning, carrying around painkillers/anti-inflammatories etc. My GP and I generally agree that the hormones uncovered an already existing IBS (just like how HRT always carries a risk of revealing or worsening conditions). He said it affects women more readily but I haven't seen this statistic anywhere. However, I am inclined to believe testosterone treatments may improve your symptoms. I'm not a doctor though.
xx