If you believe it is sexual harassment--e.g. members of the opposite gender are whistling at you in a way which traditionally indicates romantic or sexual attraction--then if it's your coworkers doing this, you well have a legal claim or cause of action. Sexual harassment at work is illegal--even when it's the more subtle kind. You may wish to speak with an employment law attorney--many provide a free initial consultation, to evaluate a potential case--to see how strong your claim might be, what it might be worth, etc. As another option, you could contact either the federal Equal Employment Opportunity Commission (EEOC) or the equivalent state agency in your state and file a complaint.