What does it mean if guy friend is suddenly sending sexual memes?

i have a guy friend who recently started sending me reels. it started with 1-2 reels a day and went to 10-12 reels a day, all within a week. suddenly he has started sending me sexual memes/reels as well. some of them i don't even understand. he explained one of them too, saying I am just lying about not understanding. i just don't understand this change in behaviour. is it just his way of showing that he is comfortable with me or is there smth more to it? personally, i don't feel comfortable talking or joking about sex with guys so just wanted to know.

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Update: today he sent me a screenshot of his Instagram chat with a girl wherein he had sent her a meme (containing a joke about penises) and was asking me what the reply of the girl means. i just- i know him since last year and he has always been quite closed off and i just don't know what changed
What does it mean if guy friend is suddenly sending sexual memes?
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