It doesn't stop me doing anything. I go swimming, rock climbing, roll around with my children etc.
No I don't worry about it smelling, bags have charcoal filters on them so no smell gets out.
I lie on my bag after getting into bed till I fall asleep. When it fills up a bit in the night it must feel uncomfortable enough to my asleep brain to roll over and not roll back.
You can occasionally get sore skin around stoma if you cut the hole in the bag plate too big but it's not a big issue. Never had an infection.
I wear a sort of compression type belt that keeps it squashed down in the day so no I don't worry about it in the day.
Sex life is fine, not affected at all. Bag can be folded up and stuck on itself with the velcro tab so it's only about 8cm top to bottom when it's like that.
No it doesn't bother me, i had such a chronic painful disease that led me to getting it, it's really the lesser of 2 evils