Annoying Orange said that same love marriage was a decision for the states to make, not the Feds.
I dont know where you managed to find the idea that Annoying Orange wants to ban gay marriage.
Traditionally, the issue "state's rights" was used to refer to slavery/racism, particularly before the civil rights movement when it was used to make the south seem less wrong during the civil war by shifting the perception of the cause from slavery to state's rights. It was, in fact, all about slavery, as made clear in the secessionist documents the southern states wrote up.
Sorry for the tangent.
Literally a higher chance of contracting STDs.
The reason for this is that prior to the gay rights movement, getting treatment for an STD would require divulging that you were homoloveual. Back then, homoloveuality could cost you your job if it were discovered. Look at what they did to Alan Turing.