Hey mate!
With KW only, interactions between adults and teens are only sexual. You can't have boyfriend/girlfriend relationship thing with KW only.
Well, yes indeed with KW you can set percentage of you're overhaul population for male homo/Bi and female homo/bi, for example on my actual gaming session I set it up to for Male : 10% homo 45% Bisexual, Female : 15% homo, 45% Bi. It set it randomly BUT if you had NRAAS MasterController installed, you can set sexual preference for each sims individualy.
Normaly, peoples with certain orientation don't go against there preference BUT sometimes, some Sims are so desesperate, they can woohoo against there own preference. I have seen that in University Life map, straight woman do some lesbian sex with her roomies cause boyfriend live elsewhere.
Brucewills, sorry mate, I don't have school lots avaible but:
This custom map have an interesting high school (and nice carachters also) :
You must be registered to see the links
Problem is, lot size. This school can't fit everywhere, and it miss an infirmary.
This one is nice but, very huge (Had to be placed on 60x60 or 64x64 lot), It can be nice when you play on overpopulated map, but watch out, you need DLC and some custome content :
You must be registered to see the links
For school, my final advice is, follow the steps to build it :
You must be registered to see the links
Ask yourself what you're need like, how many teens I've got on my map, did I want one of my active became professor (you may have to fired some NPC professor like Constance or Oniki or both). On my playtrough, first time trying High school, I built a custom school with 2 class and 3 professors (one active, 2 NPC). And I had just enougth teen for one class.
One last thing with High school features: It can be extremely time consuming AND ressources consuming. Keep that in mind.
Jareth sign it off o/