meaning of the phrase "surreptitious non-work activities"

[Thunu]

Business English Lesson, Advanced Level

ESL/EFL Test #136 "Office Technology Problems", question 3

At work, male employees are the greater time wasters when it ......... to surreptitious non-work activities.

(a) comes
(b) evaluates
(c) generates
(d) reverts

Business English Lesson, Advanced Level

ESL/EFL Test #136 "Office Technology Problems", answer 3

At work, male employees are the greater time wasters when it comes to surreptitious non-work activities.

Correct answer: (a) comes
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Can you explain the meaning of the phrase "surreptitious non-work activities" in this sentence, please?

Thank you
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Reach an agreement as ploughing, don't let argument happen at crops.

[Mister Micawber]

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Secret activities not connected with work, like surfing porn sites on the internet.
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Native English teacher at Mister Micawber's