Former civil defence force chief Peter Lim Sin Pang told the court on Wednesday that he was never interested in sex with Ms Pang Chor Mui.
He claimed he allowed her to perform oral sex on him on May 2, 2010 "out of sympathy", since she had begged "so pitifully" during a lunch meeting they had at Crystal Jade earlier that year.
This was part of a statement Lim made to the Corrupt Practices Investigation Bureau (CPIB) on Feb 22 last year.
In court on Wednesday, Lim, 52, maintained his statements merely reflected his state of mind at the time.
But the prosecution argued that Lim intended to have sex with Ms Pang and that he had created opportunity for it to happen on May 2, 2012. These points were explicit in two other statements he gave to the CPIB last year, the court heard.
Whether or not Lim intended to have sex with Ms Pang, 49, is one of several discrepancies between his court testimony and his CPIB statements which the prosecution is highlighting.
The prosecution, which applied on Tuesday to impeach Lim, wrapped up its cross examination on Wednesday morning.
Lim is accused of corruptly obtaining oral sex from Ms Pang, the former Nimrod Engineering general manager, in exchange for furthering the business interests of her company.