The most common and most likely answer to this crossword clue is the 11 letter word LOVE-MAKING
I've seen this crossword clue in The Guardian
L
O
V
E
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M
A
K
I
N
G
Buddy explains!
The straight part
We know that "intimate experience" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case intimate experience = love-making.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LOVE-MAKING mean?
LOVE-MAKING noun- Sexual intercourse
- Courtship; amorous advances