Well, if you want to talk about the maximum number of times he can ejaculate, it's actually 6, not 7, and that's by having Massive DIK status and not being with M&J. However, the MC can have more sex on the Neutral/CHICK status and being with M&J as that's 4 times compared to 3 on the other path. Also, you can't get all 9 of these on one playthrough and the Jill one doesn't lead to any sexual act that results in orgasm for either of them and he doesn't ejaculate when sexting Nicole, so those don't really count.
So, to be a bit nitpicky, it's actually more like this:
Massive DIK Status, Not With M&J | Neutral/CHICK Status, With M&J |
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Riona: +1 sex, +1 ejaculation | Riona: +1 sex, +1 ejaculation |
Melanie & Sarah: HJ/BJ, +1 ejaculation | Camila: +1 sex, +1 ejaculation |
Camila: +1 sex, +1 ejaculation | Lily: BJ/tip penetration, +1 ejaculation |
Lily: BJ/tip penetration, +1 ejaculation | Sage: +1 sex, +1 ejaculation |
Sage: +1 sex, +1 ejaculation | Maya or Josy: +1 sex, +1 ejaculation |
Cathy: BJ, +1 ejaculation | |
Sex = 3, Ejaculation = 6 | Sex = 4, Ejaculation = 5 |