having to think about it "in the moment". Stopping "the action" to put on a condom (plus, of course, making sure you have some! shopping, storing, bringing with you if you aren't home, etc)

When someone is on hormonal contraception, or has an IUD, or some kind of permanent contraception (vasectomy, tubal ligation) -- never have to think about it. Just... go with the flow in the moment :) no barriers, no stopping, no thinking about it.