"We're married first and we don't want to do anything that could possibly jeopardize that," Biggs told ET's Deidre Behar during a recent interview for their new film.
"There are plenty of other things that are going to try to bring us down as a couple," Biggs continued, "But goddamnit, acting will not be one of them!"
Biggs and Mollen, who tied the knot in April 2008 and welcomed their first child
in February 2014, also opened up about how they prioritize their marriage while balancing their careers and being parents.
"It is especially hard to have sex," Mollen answered candidly. "We have a nanny as well, living in the house, and I don't know why [but] for me, I'm just like, 'There's people here! We're not all alone!' There's just this anxiety."
"For instance, when we were on vacation [with friends], we were those people who were like, 'Should we have sex in our car?' We became those people," she added.
As for their 2-year-old son, Sid
, the cute couple said they moved to New York to try to keep him from growing up and following in their footsteps.
"I really don't want him to be in Hollywood at all," Mollen shared. "I don't want him to become an actor."
"I definitely don't want him to be in a career where he's not in control of his own destiny," she continued. "I think that I learned the hard way that that's not a fun way to make a living."
However Biggs wasn't quite as dead-set against the idea, explaining, "If acting is one of those things that he wants to do, I'm not going to talk him out of that, [but] I would encourage him to experiment, [and] to be more well-rounded."
The couple also admitted that they haven’t shut the door on having more kids one day. Mollen said they might their family sometime "in the future."
"I would love a little girl," Biggs added.