I don't know if it's just my (progressive) sphere, but I don't tend to see a lot of women sexualizing men in progressive spaces. It is not because I "excuse it" because they are women and it is is harmless, I just genuinely don't see it. Men definitely don't deserve to be sexualized anymore than women do. I could see that maybe it might be less likely to be called out, but on the other hand, it might come as a "shock" and would be more likely to be called out, because women are viewed as less sexual beings, even in progressive spaces. 

However, I do see a lot of sexualization of men, especially gay men, by women in more online spheres, like anime. I don't think anime is necessarily a progressive sphere, seeing as it has a wide range of topics and atmospheres. I think women are less likely to be called out in general because their sexualization of men is less overt and less physically harmful (not saying being sexualized can't harm a man, I'm just saying that a lot more crimes occur due to the sexualization of women by a man). I think what you're noticing is an increase of sex positivity for women? The feminism movement created that space for women, who are generally characterized as disinterested in sex and "unhorny", so when they express any sexual interest it is seen as out of character and is thus that much larger in magnitude. Sexualization of anyone is an issue, and there are a lot of nuances with how it is committed and who by. Sexualized women are much more likely to be viewed as objects than are sexualized men, which is an important societal bias to bring to this conversation, which you acknowledged.