Twainsexual, is the cross combination of pan/bi/poly/omnisexual and demisexual.
Twainsexual is the attraction to individuals regardless of gender, apart from only being capable to have a sexual attraction to either feminine or masculine individuals. One would have to have a deep emotional connection to have sexual attraction towards either feminine or masculine individuals. Gender does not play any factor in the individual's attraction.
Examples
An example of twainsexual is an individual being capable of having romantic and sexual attraction towards a feminine individual regardless of gender, then having to have a deep emotional connection to have sexual attraction toward a masculine individual regardless of gender.
Another example of twainsexual is an individual being capable of having romantic and sexual attraction towards a masculine individual regardless of gender, then having to have a deep emotional connection to have sexual attraction toward a feminine individual regardless of gender.
Etymology
The English word "twain" is an archaic term for two.