Oh boy. Well, I have read in a very limited way that if the mesh during the bladder sling procedure is not fitted precisely, it can cause an issue like this. The hard plastic on it would be the culprit. It isn't supposed to happen. I would have your wife speak the surgeon's office that performed her surgery. While it is rare, that could be what occurred. Abrasions and or scratches also could have been ON your penis from something else prior to intercourse and the friction of intercourse made the noticeable to you.