THEY DON'T call Rep. Charles Wilson (D-Tex.) "Goodtime Charlie" without reason, and he has taken a lot of kidding through the years about the girls he has romanced since he came to the House of Representatives.

Now he is enjoying the discomfort of some of his more staid and respectable Republicans colleagues whose names are being linked to blond lobbyist Paula Parkinson in Washington's latest sex scandal.

Wilson's name hasn't even come up, he gloates last week.

It was a fortitous mistake when Nancy Reagan walked accidentally into Billy Donahue's "Antiques of Georgetown" last week, thinking it was the entrance to the Club Le Serre where she was expected for lunch.

She admired two little impressionist paintings in the shop window which artist Ron Van Sweringen gave her on the spot. The paintings were valued at $750.

But, unlike foreign gifts from anyone connected with foreign governments, the paintings don't become the property of the U.S. government. Mrs. Reagan can keep them.

It wasn't exactly "Fort Apache, The Bronx" when Nancy Kissinger went to the Muhammad Ali-Ken Norton fight at Yankee Stadium in 1976, but the State Department apparently thought the secretary's wife was in so much danger that they sent eight bodyguards in a motorcade to protect her.

The details of the government security provided for Mrs. Kissinger surfaced last week in a U.S. District Court case in Manhattan in which a New York City policeman is asking $1 million for injuries he claims he suffered when hit by one of the cars in her motorcade.

In court testimony last week, the judge, Gerald L. Goettel, asked why Mrs. Kissinger needed a motorcade and a protective detail of two women and six men, including the special agent in charge of the State Department's Office of Security.

"The reason she needs protection was there was an expectation when you go into the Bronx that you need protection," the government prosecutor said.

"All those years I went to Yankee Stadium I was in mortal risk?" the judge asked.

"If you had gone at night time, you might have been," the prosecutor replied.

Mrs. Kissinger's motorcade on the night of Sept. 28, 1976, consisted of three State Department cars: "The lead car was a lookout car, the middle car was the limousine carrying Mrs. Kissinger and the last car was the escort vehicle . . . in which the security personnel rode," according to court papers filed by the government before the trial.

Not only didn't the president's oldest daughter stay at the White House while she was in town on business this week, she didn't even see her father or step-mother.

Maureen Reagan said she wasn't going to see her relatives while she was in town and would see them "later," but wouldn't specify when. She said they will both definitely come to her wedding April 24 in California and she spoke to her father on the phone twice while she was in town.

Reagan said she didn't stay at the White House "because I have a lot of business meetings and it's easier to get in and out of a hotel."