Yeah but I think it goes deeper. April was already in the 1984 comics and she was rather sexy since it was not a kids comic, but they felt the need to keep her just as sexy if not more in the cartoon, target audience 3-8 year olds. These 90s guys were really careful about marketing and the cartoon was stripped of a lot of violence and language to go with the rating, I think if they put a sexy girl with cleavage into a show for 3-8 year old boys there's a reason. And here's a lot of porn of April.
Also I remember Street Sharks, but I don't remember any of the other characters in that show. Turns out there's no girl but some skater dude instead. I clearly remember the girls. I wasn't even a particularly horny kid.
I would love to access some real data on market research, it fascinates me. I have read some things here and there and it's really wicked, like when they put a dog in a commercial it's because they're trying to elicit specific feelings, everything they put into marketing is carefully designed. They're willing to pay a lot more money to get a sports personality in their commercial, and even if you don't know who the hell he is and they need to write it in small letters, the fact you might be familiar with the face buys you an additional 0.3 seconds they can use to pitch their product.