Have obviously namechanged for this. I'm not normally one to be embarrassed, but this problem is BEYOND embarrassing.
I gave birth just over four months ago, had a very quick labour with a ventouse and episiotomy. A few days after labour, I realised I had piles. Nothing too extreme and they cleared up on their own with time (and cream)
Everything seems to be back to normal, sex has resumed and is fine, as seems to be my bum.
Except its not :( after erm, pooing, I wipe until I'm spotless and yet I seem to always have skid marks. Even after I bath. Am absolutely DYING with shame typing this! 
My pelvic floor muscles feel fine, though sometimes I feel like I cant get all the poo out when I'm using the bathroom. I'm quite sure it is poo though, rather than a prolapse?
I remember seeing something similar a few series back in Embarrassing Bodies, if anyone can remember? I've tried googling it, but no luck...
Thank you ladies. I may not reply quite as quickly as I would normally, as I MUST remember to namechange first!!! (REMINDER TO SELF!!!)