It has nothing to do with your sexuality (lesbian, heterosexual, pizzasexual, etc...). It's wrong to kiss someone (regardless of their gender or identity) without their proper consent. If someone is drunk, they can't really give proper consent.
If you're impaired in any major way, you can't give consent. That's an unbreakable cardinal rule of sexual consent. It ain't rocket science.
And even if you, yourself, was intoxicated? That wouldn't excuse the ethical circumventing of the consent issue.