it the context that your using , Plain.. can mean many thing or nothing at all. but I will give it a whirl just the same. some women look amazingly beautiful with out any make up at all = plain. some how ever look like the makeup would hide in fear = plain. it all really depends on what the guys finds to be his taste. this question would have really gotten a better variety of answers had it had pics for a fair comparison
What does "plain" even mean? That will mean something totally different to each guy. Many girls that I find hot, others find ugly and some that others find hot, I find ugly. Depends on their taste and what they find "plain."