Police are appealing for witnesses following two suspicious incidents in the York Road area of Northampton.
Both incidents took place on Sunday between 10.30pm and 11.45pm and are believed to be linked.
A man followed a woman along Earl Street and Craven Street in Northampton while talking to her in an inappropriate way.
She was helped by two passers by and the offender made off.
Another woman was followed by a man in York Road who grabbed her hand and said he wanted to be her boyfriend.
The offender is described as black, of a slim build, between 35 and 40 years old, with acne scars on his cheeks.
He was wearing a black cap, black and white shirt and dark trousers.