I honestly don't know the best way to address this situation or sugar coat it, so I'm just going to say it. But please do not take it personal or as an offense.
If you are Uncircumcised and unable to pull back your foreskin completely (please see PHIMOSIS) I WILL NOT SEE YOU.
#1 because I don't feel comfortable performing bbbj
#2 is a higher risk of the condom coming off
Only reason why I'm addressing this issue is because I have seen 4-5 guys with this condition and have not being comfortable at all.
What really caught my attention though is that guys with this condition seem to think that is normal to have the head of their penis covered and not able to push back their foreskin, GUYS IS NOT! you should be able to pull back ALL your foreskin back and CLEAN it completely. Unfortunately this is something that should have been treated as a kid, but is still not too late there is treatments other than just circumsition. Please do some research and speak to your doctor.
Again I apologize for not making it sound like rainbows and butterflies, but don't know how else to say it.
http://https://urology.ucsf.edu/patient-care/children/phimosis