Oh it is a big double standard. I can go to the beach swimwear sporting a 6-pack and no one will say anything. If a woman wears a bikini, watch out!
Men and women are both very visual. Women often spend a great deal of time and money to look good for men. Hair, make up, clothing, nails, jewelry, etc. Men spend time and money trying to put out an attractive image for women. Haircuts, designer threads, Rolex watches, high-end sports cars, teeth whitening, etc. All things to look visually appealing to women so he can have a much higher chance for successful dating. Often times if a guy looks a certain way; his chances for rejection are much higher. Women, like men are higher visual and will often times not date a man that looks a certain way and/or has a body type that they see they don't like.
Everyone hates to admit it but male-female attraction is called "sexual attraction" for a reason. If I am on the beach women are friendlier to me if I have my shirt off then if I wear my loosely fitting tank top. Likewise when I wear a designer suits/shoes and the nice watch; women tend to want to talk to me. I have no problem with that but I will not fool myself in to thinking that women are somehow less visual.
Different women and women have different looks to try to be sexually attractive. What is the standard? Depends on the culture to a great deal. If I was on the beach and a woman or man! came up to me and told me to cover up because they had a lust/SSA problem; I would suggest they look away.
Which BTW would be no different than if I said they did not which me to swim next to me because of my skin color or cross necklace. Sorry, I can't be everything to every person!