The woman I lived with in college loved them. i think that she liked the long, slow insertion I'd do with the wide nozzle, giving her repeated shots (?) of full-bulb loads until she didn't think that she could take another drop. I think the constant cycles of loading, insertion and delivery made her hotter than a $5.00 pistol, and much wetter.
Interestingly, she'd want to have anal intercourse after completely expelling all the soapy water (then taking several bulb-loads of clear, cool water) from the bulb enemas, but when we'd use a double balloon catheter to give her a 4-5 quart soapy enema, she liked retaining it with the catheter in place and having vaginal intercourse, doggy style.