Sex drive as a symptom?

I'm confused about the sex drive portion of in the daily reports.  Sex drive is listed alongside symptoms & problems, and the app seems to treat it like something bad.  How can a sex drive be rated as "mild, moderate or severe"?
In the report summaries, sex drive appears like:
"I slept for X hours"
"I feel happy and tired"
"I had fatigue, sickness and sex drive"
Is this a bug?