By Alex Last
BBC News, Lagos
There is a probe into Mr Obasanjo's spending on power
Former Nigerian President Olusegun Obasanjo is under a wave of criticism for the conduct of his administration, which came to an end last May.
But in a court in Lagos, he is accused of a very different kind of misconduct - that he slept with his son's wife.
The allegation was made by his son Gbenga in a sworn affidavit, submitted to a divorce court.
The case has been adjourned while the judge considers a request from Gbenga Obasanjo's wife, Mojisola.
Mojisola, who claims her husband was violent to her, has asked that the proceedings continue in private.
As part of divorce proceedings, Gbenga Obasanjo alleges that his wife slept with his father in order to get government contracts.
All the while, the former president has kept silent on the subject.
Despite the lurid allegations and the shock that they have actually been made public, the real concern for many Nigerians is less the alleged sex life of their former president, but the failure of his administration to deliver basic services.
In the most damaging investigation to date, a house of representatives panel has been asking what happened to the $13bn (£6.6bn) Mr Obasanjo's government spent on power in his eight years in office - given that there is still a crippling lack of electricity in Nigeria.
The current government has indicated criminal proceedings may follow.
There is speculation that the next investigation could be into the running of Nigeria's multi-billion dollar oil and gas industry.
Now that, Nigerians say, could be really scandalous.