lust and high lust stat is a debuff, because you cant concentrate on the battle, enemies when in high lust tend to do more grabs (full nelsons) to overpower you, throw you on the ground or insert it while youre both standing up, or maybe orally (depends on the enemy), if you have high lust, you will get erections faster
continue and fail checkmarks (if i understood you correctly) mean that you have high enough stat for that to pass it and go without any big concenquences or none at all (for example, if you pass next to ettin, you jump off the cliff and you have enough endurance i think, you wont fall unconscious and get filled by her), or if you stand on brigands/werewolves map piece, and you fail the perception checks, you will get pounded from the back (i just want to say that you can fail a skill/stat check on purpose to get a different start and maybe an end of the encounter)
sluttiness and purity checkmarks is something mostly comes at the end of the fight, im some occasions sometimes before it, and its when you will be receiving a cock how you will act (if youre innocent, you will just be dazed and suprised when someone shows you their penis, not knowing how you should act , and i think they will go easier on you or something like that, and if youre slutty, you will instantly get on your knees or all fours, but i think its all the same cause you get filled no matter what, just the scrypt and the chitchat is different