Submitted by stardustthepony:

Here is Dolphin anatomy. As you can tell, the female has mammary glands on the side of her vag aka genital slit, not in her anus. Sorry, Im a nerd when it comes to marine life. LOL
Edit by Rat:
Science! Thanks stardustthepony! I got some other interesting messages, and apparently the anal/gential slit is one big slit in the female (where there are still two different openings, the anal one and the vaginal one!), while in the male it looks like an exclamation mark, since the anal opening is in a different slit than the genital one. I found this neat picture:

That’s the genital slit containing the anus and the vaginal opening, the small ones to the side are the mammary slits for delicious Dolphin milk!
The more you know!