Most of my sexual life I've been a top, so it wasnt really up to me to solve the arcane mysteries of setting up an ass for humping. But in my last relationship, the problem did arise.
Reading through the posts, I can see a trend, which I can acknowledge as my own too:
There's a difference between prepping when in a relationship and when hooking up.
Most of those who werent very focused on enemas, diet, waiting times, fasting and food abstinence, were those in a relationship. While those appalled by lack of enemas every 2 hours, where mostly those into hooking up.
When you're going to hook up or getting a sex date, of course you can plan everything. And good for you. But if you're in a relationship, it's kind of impossible to plan a fuck (and honestly, to me it's also sad). Things are more spontaneous, and spending a lot of time together (and often living together), offers countless chances to impromptu humps. Fortunately, I live in a country where each and every bathroom has a bidet, and it's common practice to have a thorough cleanup after you dish out your dishes, and it always has been all that was required to never have any problem striking an ass.
And, to each his own, but when I hooked up, I never got my dick fudge iced, also because I always used a condom. Cause, honestly, without a condom striking oil would be the LAST of my worries.