Photographing models in lingerie outdoors can be tricky. Obliviously the most important thing is seclusion. If you live in urban areas then it is twice as difficult. Abandon buildings however make ideal location spots. Make sure its safe and clean. As for beaches shooting lingerie near public beaches usually poses a problem with onlookers, which makes your model less comfortable. Beaches further away from the city offers more privacy, If that's not possible try organizing a beach shoot during off season (April May or September October),. Another option is to rent a beach house with access to a private beach. Beach rentals can range from weekends to seasonally. This can cut into the budget but.can be offset by sharing cost with other photographers with similar interest.