In my observation, the activist organizations have been indifferent to age of consent in whatever cases that age of consent is 18 for both same-sex & opposite-sex relations. That implies 18 is plenty old enough so long as it's uniform.
If you can find evidence to the contrary [e.g. advocacy to reduce a uniform 18 year age-of-consent threshold], I will reconsider.
When most states have the age of consent at 16 or lower you know I cannot. However, that said its still disconcerting that the rush to have ability to have sex with a minor generates so much energy.
Again, I could understand the case beign made that we ought to raise the other ages to meet the higher gay age but that isn't their quest.
The desire to lower their age to 16 in most states is in itself very telling about the nature of the importance of gay relationships with minors. One wonders why there are not enough partners at the age of majority.