The two markets have always appeared to attract the same type type of person – in the past.
I believe the online casino now attracts almost a 50/50 mix of m/f.
I may be wrong, but I think the ‘adult’ market may have a higher male to female ratio.
But, why dilute your focus from gambling?
I would continue in one industry and just get into different niches.
There is enough to keep everyone busy forever!