MANILA, Philippines - With his victory all but certain, focus on presidential frontrunner Sen. Benigno "Noynoy" Aquino III's political plans has ramped up even as he prepares for a six-year stay in Malacañang as the country's Chief Executive.

In recent interviews, Aquino has spoken up about his plans to raise revenue, cut spending and investigate corruption allegations against President Arroyo and her official family. He admitted that he is still getting used to life as a public figure and has yet to decide if he will quit smoking.

He has also revealed that his high-profile sister, actress-TV host Kris Aquino, has opted not to have a role in government, while his girlfriend, Shalani Soledad, will be busy as councilor in Valenzuela’s 2nd district. (Read: Noynoy speaks on Binay, Kris, Shalani et al)

The revelation doused speculation that Soledad would be a "First Girlfriend" to the still unmarried candidate when he becomes president. Official protocol also does not grant an official title to the girlfriend of a sitting president.

Soledad's relationship with Aquino has sparked widespread interest after the death of Aquino's mother, Cory Aquino, last year launched Noynoy's presidential bid. Soledad campaigned heavily for Aquino even as she sought to be elected councilor of Valenzuela City's 2nd District. (Read: Noynoy's girlfriend proclaimed Valenzuela City councilor)

Three unmarried chief executives

Columnist Manolo Quezon said at least three unmarried people have served as the country's chief executive.

During the American occupation, US President Franklin Roosevelt appointed Detroit Mayor Frank Murphy as governor-general of the Philippines in 1933. Since he was unmarried, Murphy's sister stood as First Lady during official functions.

Elpidio Quirino was already a widower when he won the presidency in 1948. His daughter, Vicky, stood as First Lady.

Finally, Corazon Aquino, mother of Noynoy Aquino, was a widow when she became president in 1986.

Quezon said an unmarried president is not unheard-of in political circles, pointing out that Noynoy's own mother did not have a spouse to escort her during state functions.

He added that being single could help Aquino avoid the controversies hurled against the spouses of Philippine Presidents Ferdinand Marcos and Gloria Arroyo.

So far, none of Aquino's sisters have shown any interest in being First Lady of Malacañang if their brother is President.

Aquino's sister, Viel, said the entire family is supportive of Aquino's relationship with Soledad. She added, however, that their brother is too busy with the campaign to even think about marriage.

"I think it's better if he has a wife so hindi na kami magkakapatid ginugulo niya. I think it's not an immediate priority for him and he said so. We like Shalani and if [the wedding] happens, then good," she said.  -- based on interviews and reports of Ces Oreña Drilon, ABS-CBN News