thoughts

It's unfortunate that so many automatically associate this & cutting with all Borderline sufferers. While both are struggles many with BPD experience it certainly is not the case for all of us.

Sexual promiscuity is just one of many risky behaviors in which some with BPD engage (and again, this is of course not true for all Borderlines) Some other examples are cutting or other self-harm, substance abuse, driving fast, overspending. As with any illness, not everyone with the disease has all symptoms - some with BPD engage in one or more of these risky behaviors, while some do not engage in any. (Sorry to be repetitive & redundant on that point - just want to make it clear for others with less personal knowledge than you).

There are a few main reasons for this particular behavioral manifestation:
1) Due to feelings of worthlessness, hopelessness, & quite often continued suicidal ideation and/or tendencies - it just "doesn't matter" (simplified greatly, but hopefully is understandable).
2) Due to a fear of abandonment, yet often self-sabatoging so as not to vulnerable to the pain of being "rejected" - therefore having trouble with intimate relationships due to this fear of losing people (it's a horribly viscous cycle).
3) Due to mood-regulation issues, these behaviors often stem from a need to feel something very strongly (as in moving fast, cutting, or even sex) to feel truly alive and/or to alleviate/distract from the massive inner pain.