Most times we cover up a lot of things based on 'religion' and not try to be realistic. ( any type of religion by the way)
What do i mean? we always have this habit of 'religionizing ' everything and in that sense don't address some vital issues. like sex..and also by the way, God created sex, not the devil...
everybody is so consumed by the 'before marriage' than the 'in marriage' which is a lifetime committment. its good to see and check things out....believe me you need it.
what really and most importantly applies here is your level of self control, not the fact that you don't or do want to have sex before marriage. self control will determine what you do, ( some people will say no matter how hard you try man go still fall) but believe me you can have self control...it's very possible.
if you want to marry somebody you definitely need to see things for yourself...example.... body odour, private part odour, curved penis, short one, small one, circumcised or not, damaged or not able to perfome kinda things....nipple discharge, no nipple.. back acne, rashes, erectile dysfunction, reactions to things, etc.... and so many more millions of things.. the main aim is so that it can be addressed if you guys are going to be spending a lifetime together.
All you need do is have sense when you're doing it, that sense can only come from God and being honest/sincere with yourself..
My take has always been know yourself so that you are comfortable knowing someone else...it helps...and God knows everything, we can never decieve him in any way...