I was actually thinking the same thing as Kiric xD
Not sure if that 'thanks' was laced with sarcasm or not, I doubt it... but still xD
I'd personally prefer anime, or at least artistic representations.
Photography works for many RP's, but I'd have trouble picturing the somewhat cartoonish styled caricatures that are digimon, standing besides real people. It's a trivial matter, but it just feels a bit... odd?
Either way there are plenty of anime styled images if you know where to look
As for digimon and their shapes, I'm fine with the more beastly types as well, but it's more the youthful look that bothers me.
The Japanese term for rookie digimon is essentially characters experiencing their growth spurt, and that's a bit too kiddy for comfort in my mind. Gatomon is cute, but honestly not smut material for me. That said there are some exceptions like Renamon who categorize as rookie but seem older than Gatomon, Agumon etc.
I know the Real-Vergil stated "Sex will be allowed, but won't be the main focus" so it's not an imminent issue, but if it'll be present, I figure it applies regardless.