Anyone would think Canada's Prime Minister Pierre Elliott Trudeau, 51, was a male chauvinist or something, to listen to Helen Gurley Brown, 49. Asked on a Canadian television show what she thought of Trudeau's recent marriage to 22-year-old Margaret Sinclair, the sexpert editor (Cosmopolitan) and author (Sex and the Single Girl, etc.) used the unminced word "outrageous." Said Mrs. Brown: "What I think your Prime Minister has done is set back the cause of a certain kind of equality for a long, long time. I think the idea that you must go and pick someone nubile who is 29 years younger than you is not any example to set for the rest of the men in the world."

Back in his Harlem pulpit for the first time in four months, the Rev. Adam Clayton Powell, 62, told the 2,500 faithful in his Easter congregation that he was retiring. It might have been more of a shock--Powell has been pastor of the Abyssinian Baptist Church since 1937--but the ex-Congressman's stock has fallen nearly as low in the church as it has in politics. Not long ago, for example, he tossed his wallet onto the Communion table and offered to bet $1,000 that nobody in the congregation could prove to him that it was wrong to drink whisky or sleep with women (no takers). Powell's consistent absenteeism in favor of relaxing at his Bahamian home in Bimini also cushioned the blow. Said one church member last week: "You don't miss what you're not getting."

The Seventh Avenue assassins who work for Women's Wear Daily don't care whom they cut up with their sharp pinking shears--even America's First Fiancee, Tricia Nixon. After her picture appeared showing her, sweet and sailor-hatted, with her intended, Edward Cox, WWD's men named Tricia (who is 25) "one of the best-dressed children in America." Then they went on to nominate her for the 1971 Goody Two-Shoes Award. "She dresses as children should," they snickered on. "She's definitely one of the best-dressed subteens in the country. Will Fiance Cox change Tricia's fashion image? The children's wear industry hopes not."

"I find that I like cold countries now," said Newscaster Lowell Thomas last week as he celebrated his 79th birthday. "The heat takes it out of you." The heat isn't all that does it. At Miami's Crandon Park Zoo, where he was visiting Mohan, a 1,500-lb. rhinoceros that he had helped to capture, Thomas turned to talk to the keeper while feeding his rhino friend some greens. Mohan munched the greens and went right on munching until he was lunching on Thomas' trousers. "I was lucky," said Lowell. "If he had got hold of me a little more firmly . . ."

Is there anything more to be said about Jacqueline Bouvier Kennedy Onassis? The surprising answer is yes, and the proof is the latest Jackie-book. Jacqueline Kennedy, The White House Years, by Mary Van Rensselaer Thayer, a veteran writer and Jackie's longtime friend, is filled with verbatim memorandums that document Jacqueline's passionate perfectionism and attention to detail. She constantly bombarded the White House chief usher, J. Bernard West, with memos about minutiae. ("Also in the Blue Room make sure the braid on curtains is turned in as if braid faces out it gets sunburned . . . We need cigarette boxes --something to replace ones with flying fish and dollar bills on them.") Jacqueline designed a dream house in Virginia, but President Kennedy did not like it much and spent only four weekends there. Last week the estate on Rattlesnake Ridge was on the market again. Asking price: $350,000, $125,000 more than the present owner, a Chinese-born investment adviser, paid for it in 1964.

History's most famous diet--Worms --is having its 450th anniversary this week, and Roman Catholics in that town on the Rhine have appealed to Pope Paul VI to say a good word for Martin Luther, whose refusal to recant there precipitated the Protestant Reformation. Referring to the Pope's acknowledgment that the Roman Church was partly responsible for the Protestant-Catholic split, the six Worms laymen and clergymen who signed the appeal called for a papal statement "bringing detente in the ever-present tensions regarding the excommunication of Martin Luther."

The Curt of Curtwel Enterprises is now separated from the Wel. Patrick Curtis has left Raquel Welch. Patrick, who has a distinctive acting record of his own (he played Olivia de HaviIland's baby in Gone With the Wind), discerned Raquel's talents when she was a nothing and hard-sold her into a Something. Said Raquel to an interviewer: " 'Ho-ho,' I say to him. 'You look like a real nasty Svengali. Aren't I glad you pulled me out of the gutter when I was just lying there with no teeth and flat as a board?' "

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