How to change paragraphs in action-driven stories ???

I'm having trouble in dealing with writing action-driven stories on the internet. Something like erotica for example, erotica: less dialogue and more action. I used to write each paragraph filled with several sentences and dialogues about one person. It can stretch up to several lines in text file. I change new paragraph when I want to tell about other person, with same style. Such style makes me easier to write coz I dont have to worry about the annoying paragraph rules. At the same time, I maintain the ultimate rule, each paragraph only tells about one person. So my old style of writing is like this:

A talks. A does something. A feels something. A talks again. A responds to B. A talks. A does something.
B does something to A. B talks. B feels something. B talks. B does something.

However, when I submitted my story to an online free website. They returned my story saying that I had to change paragraph for each new speaker. I was shocked and annoyed at the same time. Apparently, my paragraph looked jumbled (dialogue mixed with naration) that they assumed I mixed speaker A and B in one paragraph without even reading my story!

So now, I try to adopt the new style of writing BUT come across the same problem. How to separate paragraphs in less-dialogue stories. I do try to separate all dialogues from naration. But I end up confusing myself coz several new paragraph in a row tells about the same person. My new style is like this:

A talks (short sentence)

A does something (long sentence)

A talks (long)

B talks (short)

B does something (long)

B talks (short)

A talks (long)

B does something (short)

B talks (short)

I do try another way, to collect all A's dialogue in one paragraph but it doesn't work. As I say, it's action-driven story. Some dialogues are meant to be spoken after an event.

You can see why it's confusing, Even I who write it gets confused! I honestly like my old style better, less confusing but it's not popular with mainstream writers apparently I think my old style works better on computer screen. But if it's put in printed form, u'll get big chunks of paragraphs in each page.

So I need advice from u guys. How can I adopt new style of writing WITHOUT confusing myself and my readers???