Officers want to speak to the man pictures about what happened outside the local post office and stores in Green Road, Wivelsfield Green at about 4.10pm on Monday 15 March.
Three men in a parked red Nissan truck, amongst whom this man was a passenger, were making comments of a sexual nature towards a woman.
A second woman intervened and was subject to threatening behaviour from the same group.
Enquiries are continuing, including to trace the vehicle the three men were seen to be travelling in.
PC Michelle Holdstock said;
"If you saw anything of this very unpleasant incident, or have any other information that could help identify this man or those with him, please contact us either online or by calling 101, quoting serial 922 of 15/03."
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