Democrats and Republicans have been examined and interviewed for their opinions on any number of things, mostly having to do with politics and positions on major and minor issues. What generally hasn't been of political party polling concern is sexual activity. Now the privacy of the political party bedroom has been invaded. A survey of some 350,000 women revealed that when party-affiliated wives have time alone with their husbands, it's the Democrats who make love and the Republicans who watch television.

A four-year survey conducted by Ladies Home Journal reveals that registered Democratic women prefer sleeping in pajamas and making love to their husbands, while Republicans prefer sexy nightgowns and watching television. What that means, if anything, is anyone's guess. There was no report on the sexual activities of independents, who probably like to make love while watching Johnny Carson. For Sale in California

The price has dropped on that 48.5-acre California estate formerly owned by embattled auto maker John DeLorean. It's the Pauma Valley home that passed into the hands of DeLorean's attorney in lieu of payment for defending him and winning on charges of cocaine trafficking.

Over the last four years the estate has been offered for sale several times. The original asking price was $4 million. Then it went to $5.2 million so DeLorean could levy that against his bail. Then it went down to $3.7 million, and now it's at $2.7 million. For potential buyers the property, known as La Cuesta de Camellia, includes a 5,720-square-foot adobe main house, two guest houses and a five-room house for the ranch manager, who oversees 17 acres of citrus groves. Out and About

That big black limo and those intense-looking security men outside Elizabeth Arden's on Connecticut Avenue yesterday were there because First Lady Nancy Reagan was inside for a bit of leg waxing . . .

If you're the governor of Puerto Rico, you take rum seriously. It's the island's number one industry, and rum is reportedly the best selling spirit in the world. Puerto Rico Gov. Rafael Hernandez Colon is expected in town tomorrow to present a special award to Ramon (Muncho) Marrero, the 82-year-old creator of the pin a colada 29 years ago at the Caribe Hilton in San Juan. The presentation will be made at the Washington Hilton, where this year's national pin a colada-making contest will be conducted tomorrow with competitors coming in from six states . . .

Singer Kate Smith, who died June 17 at 79, left the bulk of her $500,000 estate to two Catholic charities: St. Agnes' Roman Catholic Church and Uihlein Mercy Center, a hospital. Both are in Lake Placid, N.Y. She left $25,000 to "my dear friend" Terence Cardinal Cooke, the archbishop of New York who died in 1983. Smith was converted to Catholicism in 1965. Because of Cooke's death, the bequest reverts to the estate. She left small amounts to relatives . . .

Royal Watch: If you're still running to the mailbox each morning looking for the invitation to Prince Andrew and Sarah Ferguson's wedding, forget it. It isn't lost in the mail. You aren't among the 1,800, but you can join the estimated 300 million who will be able to attend the Westminster Abbey ceremony via television. It may not be as big an event as the 1981 marriage of Prince Charles to Diana, but some 4,000 applications from the media to cover the event have been sent to Buckingham Palace. The wedding cake, incidentally, is heavily laced with rum. There was no indication where the rum was made.