Oh Simcha you are such a good bf,
Me on the other hand is very different. Im an über clean freak! Scat and anything to do with poor hygiene puts me off straight away and I usually run and scream uncontrollably when it happens.
Happens a few times, worst incident is with my ex, he felt so bad, and I probably made it worst for him

But I did tried to reassure him though after but just couldn't do it with him for a while...which is probably why he is my ex now..
Anyway, word of advice:
1. eat lots, I mean LOTS of fibre, if you can't, just buy metamucil, they are a brilliant product the new version is tasteless and dissolves in all foods and beverages. Not only does increase fibre gives you better health, but it makes those really clean poos (Those poos that doesn't stick to your inside at all and just pop straight out in one piece), it will save you money on toilet paper and save you from having any embarrass moments.
2. Don't have anal sex with a drunken person, even during the heat of the moment. When I say drunk I mean completely hammered. Alcohol gives you a diahrea effect, it makes everything more runny and people just 'loose' it
3. Douche! Get used to light douching regularly, even though you aren't having anal sex, its good for your bowels, and having regular ones, so you can be accustom to the water level to expell out...so you know its all OUT. Once you know what you are doing, it really only takes 10 mins or so, just like having an extended shower (also if you have a lot of fibre in your diet, the water usually comes out clear anyway, just really wash out the tiniest residue left, so no problem doing it while having a shower)
4. Have regular bowel movements, get into a routine to have bowel movement at least once a day, during a certain time of the day, so you always know when are you 'most empty' and are most suitable timing for sex. I always have mine before I have my shower in the morning at home, so I don't have to use public toilet, and I can give it a cleaner wash straight after. I still think just toilet paper is not enough, especially if you want someone to rim you. I don't know how people get streak marks, thats just wrong. (Just a week ago, this really hot guy in the same apartment building asked if he can put his whites into the same dryer while I was drying my whites, even his undies were clean, you can visibly see the streak mark in them, he is definately not consider 'hot' anymore, and I don't do special favours for him after LOL)
If do it right, it can be very very clean
