Health, Obedience, and Stress are all visible on the side - but can't find lust anywhere?? Are we supposed to be able to see it as a stat, or is it just something we have to guess at using the end of the day report?
Also, I haven't encountered problems with combat yet, but supposedly lust might affect that as well?? Yeah I'm real confused.
Almost every relevant stat can be seen by using the Mind Read spell, including lust. Why is lust excluded from the basic interface? I don't know, maybe there wasn't enough space or maybe it wasn't considered to be important. Lust has limited impact on gameplay.
If a slave has moderately high lust, then there is a weak debuff. If a slave has very high lust then there is a less weak debuff. Either way it is unlikely to significantly impede your combat abilities past about level 4.
