Two consenting adults, including relatives?

[max-greece]

This topic is getting very confused, very quickly.

The OP asks a fascinating question on incestuous gay marriage and I'd say we need to address that one before we go off all over the place on who else should be allowed to get married, have sex, express their sexuality and so on and so forth.

IMHO the whole point of the gay marriage issue was that a same sex couple should be allowed the same rights as a heterosexual couple in that they should be allowed to marry.

If this is the case then I would say that the same sex couple, if they wish to marry, have to accept the same restrictions, rules and guidelines as a heterosexual couple if they are to marry.

If society deems that relations can't marry then it applies equally to both homosexual couples as it does to heterosexual ones.

Whilst the original rules for marriage probably did have a basis in the potential impact on progeny of close relations marrying I don't think that is the issue.

Conversely if same sex marriages were to allow incestuous relationships then denying the same right to heterosexual marriages is discrimination on the basis of sexual orientation.

The issue here is marriage - not the sexual acts themselves.