When a clandestine couple kisses, it is much more likely that sex will immediately follow. This is because there is much more risk. Once you have kissed secretly, it is very difficult not to have sex. It would be impolite not to have sex. You have to show that you are serious about each other.
The government has to treat all citizens equally. I am a strong supporter not of a weak version of civil unions, but of a strong version, in which the rights that are conferred at the federal level to persons who are part of the same-sex union are compatible. When it comes to federal rights, the over 1,100 rights that right now are not being given to same-sex couples, I think that's unacceptable.