The man, who cannot be named for legal reasons, has pleaded not guilty to raping his wife in their Northern Tasmanian home on June 16 last year.

While giving evidence on the third day of the Launceston Supreme Court trial, the accused said he was very annoyed and upset about the questions police were asking.

"I'm not a violent man," he said.

The man told police he didn't have sex with his wife on the night in question, but on Thursday he told the jury the couple did have consensual sex that night.

When asked by crown prosecutor Linda Mason if he deliberately lied about whether the couple had sex because he thought police were more likely to believe him the accused said: "No, that's offensive."

Thirteen days before the man was arrested, the court heard he'd bought a bunch of lilies for his wife as a peace offering because the couple had been in conflict.

"I wanted to please her," the man said.

The woman, who took the stand earlier this week, told the court later that night her husband got into their bed and tried to have sex with her.

The court heard she asked him to stop and told him she wanted to go to sleep, but he put his hands around her neck and told her he could do anything he wanted.

The accused denied the allegations when Ms Mason put them to him, saying he had a clear recall of the night and his wife freely took part.

Throughout the trial the court heard the woman expressed to her husband and other people she didn't want to be intimate with him in the months leading up to June because she felt forced sexually and she'd lost trust in him after catching him looking at pornography.

The accused said he'd used willpower and prayer to stop looking at pornography.

The woman also told the court her husband would belittle her, make derogatory comments about her looks and weight, and would say her mental health issues impacted her parenting.

The jury was told the accused knew of the mental health issues the woman had, which stemmed from a childhood trauma, and would say he saved his wife by marrying her.

The pair first met when the woman was a teenager, the court heard.

"I didn't have much to do with her until she came into the home when both my wife and I were foster carers," the man said.

In her closing address, Ms Mason said the background of the couple's relationship was crucial because it showed there was a power imbalance.

Defence lawyer Garth Stevens said in his closing address said the woman might not have wanted to have sex on June 16 but she consented.

The trial before Justice Michael Brett continues.