Birth control is about family planning,  which is something responsible married couples do.  You have no way to know why insurance is being used,  who is married and who isn't,  and you have no need to know.   It's the default mindset of the rightwing naysayers that is always in the gutter speculating the worst about the motives of others... especially the motives and morality of women.  We see it over and over again here on these boards.  If you don't want to be seen that way,  then don't do it.