Porsche sales to women have doubled in the past two years, contributing to a year-to-date sales increase of 31 percent.

Porsche is having a good sales year in the US, with 25,129 vehicles delivered year-to-date coming off the automaker's best July sales ever. That's a 31-percent increase over the same period last year (19,253 deliveries). With year-to-date Panamera sales a surprising 36 percent lower than last year, what possibly could be driving Porsche's sales surge? If you answered Cayman and Boxster sales, you're right. But dealerships are noticing another factor: more women are coming in to buy Porsches, CNBC reports, the bulk of whom picked up new Cayenne SUVs. The German automaker's sales to women in the US have more than doubled in the past two years, increasing from 7 percent to 15 percent. This has helped year-to-date Cayenne sales reach 11,082 – 31 percent higher than the same time last year.

Porsche executives have been trying to tap into the women's market, as evidenced in part by the company's move to pick professional tennis player Maria Sharapova as a brand ambassador. Porsche maintains it has not moved to dramatically change its brand image, but it has shown a number of ads in recent years that uncharacteristically emphasize its vehicles' practicality under the "Engineered for Magic. Everyday" banner – some featuring female drivers.

Be sure to watch CNBC's video report on Porsche's female movement below – you'll also find one of the aforementioned Engineered For Magic ads as well as an interesting case study video on the campaign from ad agency Cramer-Krasselt.