The former Beverly Hills, 90210 star confessed she and her husband have put off plans for the actor to undergo the procedure in a bid to halt their baby making, after realising they lacked the funds to pay for it.
In a recent People magazine interview, she explained, "We're in the entertainment business, and things change year to year. We don't have a series on the air right now, so we have to be more restrictive of what we can spend, just like anyone who doesn't currently have a steady job."
But her husband insists her vasectomy reveal has been blown out of proportion - they simply chose not to go forward with a top doctor's plans for the reversal operation, because his fees were too high.
MCDermott explains, "We're human and life has ups and downs and sometimes your bank account is flush and sometimes it's not and it happens... I went to this particular doctor, because he's the best at the reversal. He doesn't take insurance and the estimate was pretty high and we told the business manager and he was like, 'That's a lot'.
"I didn't pursue it. It's not that we couldn't afford the vasectomy... I just didn't look for another doctor."
But the actor, a dad of five, insists the couple won't be having any more kids - vasectomy or not: "Tori doesn't like the idea of a vasectomy because it's so final... but I don't think we'd have more (children), especially after what she went through with (last child) Finn - she had a placenta previa and she spent two months in the hospital... We could have lost the baby and her. And physically, it took a lot out of her - four kids in six years, that's tough on a body."