TOPIC: Tight orifices and blood flow

I have always had problems maintaining hard Erection. I have noticed that the tighter the vagina, or anus the faster my Erection goes away and I alternate with blowjobs every few minutes to keep it up. Literally the blood is squeezed out of the penis. I spoke with some guys having similar problems with very tight condoms.
My question is addressed to the ones who had significant Girth enhancement:
- Have you noticed such problems when going into tight spaces?