Has Anyone Ever Used Non-Lubricated Condoms?

Hello, all. :)I have some questions about non-lubricated condoms. I plan on using them for receptive oral sex to protect from STD's, without any additive like flavor or food (I'd rather just suck the safe plain condom than have something that could potentially ruin the condom).First, are Trojan brand condoms reliable? They sell some cheap non-lubed condoms and they are the only condom brands I know off the top of my head.Second, are they lubricated on the inside so it slides on the cock easily? I'd imagine it would be difficult to get on without lube there (if no lube inside, how would we put it on)?Third, have you just ever used them? Did you have a good experience with them? Any problems?Thanks for taking the time to answer my questions. :)