Unfortunately, the best a parent can do, is to advise their child/children, if they are going out to take sensible precautions. THe usual, enough credit in your phone, go out in a group etc., Common sense is the best approach here.
Unfortuantely this is an extremely sensitive subject for me, as my(then) 15 year old daughter was raped at 4 in the afternoon in a busy city centre, and unfortunately, no body came to her rescue, unfortunately, it was a totally random attack, and to this day, we do not know who this individual was or is.
Still having to deal with the fallout of this heinous criminal act.
I have become extremely paranoid eveytime she goes out, every time she comes home, i breathe a sigh of relief.
Men who are intent on raping, will do regardless of colour, size, looks etc., of their victim.