It isn't perception, it is teleological. The female body is objectively more alluring to men than the male is to females because of biology. It is more hormonal and naturally ordered towards being acted towards, or upon, by men, not the other way around.
So no, female and male suggestive pfps are not held to the same standard because they are different not the same.
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What is considered "modest" is a social construct
What is "sexual" within humans is biological, it is based on dimorphism within humans. Feet for example are a lightly or not very dimorphic trait, that is to say they are not influenced much by hormones and don't indicate sex, breasts are an extremely dimorphic trait because they are highly influences by hormones and indicative of sex.