The research by lastminute.com found that 27 per cent of people had slept with a senior colleague at the work’s Christmas party.
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A further 25 per cent admitted to kissing a senior colleague and 18 per cent said they had slept with a colleague who was junior to them.
The survey also found that workers in Liverpool, Belfast and Newcastle were most likely to kiss a senior colleague at the Christmas party.
The top ten Christmas faux pas at this year’s festive office party
1. Had a rant about/at another colleague (28 per cent)2. Slept with a senior colleague (27 per cent)
3. Kissed a senior colleague (25 per cent)
4. Danced/sung embarrassingly (22 per cent)
5. Spread gossip (20 per cent)
6. Slept with a colleague more junior than me (18 per cent)
7. Confessed to having feelings for a colleague (15 per cent)
8. Kissed a colleague more junior than me (13 per cent)
9. Told an inappropriate/un-PC joke (9 per cent)
10. Wore an inappropriate or revealing outfit (6 per cent)
The survey also found that the festive frolics of the Christmas party season are costing UK businesses a whopping £259m in lost man hours as the productivity levels of their work force plummet to an all-time low the morning after the night before.
A quarter of the British work force will put in less than four hours work the day after their work Christmas party, up by 7 per cent compared to 2011.
lastminute.com also reveals the top experiences for Xmas parties this year were restaurants, going to a bar and staying at a hotel.
Over a third of UK adults went to work hungover the day after the Christmas party, with Glaswegians topping the list of cities most likely to go to work with a sore head.
Almost a fifth were late getting in to work or didn’t make it in at all whilst nearly a third sensibly took the post party day off.
Cities most likely to be hungover at work the day after the Christmas party:
1. Glasgow (54 per cent)2. Cardiff (52 per cent)
3. Leeds (46 per cent)
4. Belfast (44 per cent)
5. Liverpool (43 per cent)
6. Brighton (43 per cent)
7. Newcastle (42 per cent)
8. Edinburgh (40 per cent)
9. Manchester (39 per cent)
10. Bristol (34 per cent)