Generally, you should use a cloth tape measure to measure dick. There are instructions online if you look.
Also, 8 inches to the hilt is often not pleasant, so work with your partner and learn how deep your sigmoid colon is, and take it slow. Big ol' dick slamming into a wall is not fun unless you are very particularly into it.
I'm not gonna lie, I straight up love taco bell. I avoided it for years and years because of the stereotype about it making you sick or being cheap and gross. Then I was out a few years ago and had 2 dollars in change and an empty belly. That shit was good and no stomach upset. It's now my go to fast food, especially considering it's easy as hell to get veggie options.
Also, gas/bloat is not specific to taco bell, it's fucking beans. Eat anything with beans and you're gonna get gassy. Not directed specifically at you, just anyone who needs to hear this.