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Writing a poem, cooking a meal, walking 500 miles and then 500 more (so, 1,000 in total) - all well established ways of showing you love someone.
The reason the world - or at least some of it - questions their love is because Milijana Bogdanovićis 21 years old and her fiance Milojko Božić is 74... so that's a fair old gap.
Still, despite Milojko undergoing heart-surgery back in December, but the pair claim they have sex most days, without the need for Viagra. Well, good on them, I guess.
In order to prove there is nothing dubious or fake about their relationship, the pair have decided the best thing to do is appear on reality show Parovi (which translates as 'Couples') and bang every day. Milijana even said she wouldn't mind getting knocked up while on the show.
She said: "The men on Parovi are mostly young. They don't have grey hair or wear glasses. So they don't have a chance with me.
"We plan to cuddle and love each other there as if we were at home. I really want to prove to people that this is the real thing between Milojko and me, and not a marketing trick like everyone says.
"Of course we will have sex, why wouldn't we? I would love to get pregnant and give birth to a baby, hopefully. If not on Parovi, then after we leave the show."
Unless a season of Parovi lasts more than nine months, I reckon you'll probably have to wait 'til after the show to give birth, Milijana.
But if you simply can't wait to scout out a decent Serbian TV stream and watch the two get at it, Milojko has given us a little insight into what we can expect - and it's bad news for missionary fans.
He said: "It's enough to put my hand on her stomach and she wants sex.
"Milijana loves me to spank her on the bum! When it comes to positions our favourite is from behind.
"I would love to do it from the front, but I can't. Because of the heart surgery I cannot do missionary position."
The couple's relationship has apparently stunned neighbours in the village of Pilatovići, in western Serbia's municipality of Požega.
Milojko has three children from his first marriag - aged 40, 35 and 30 - and two grandchildren, aged 13 and 11. He plans to marry Milijana in a registry office on 7 September after their local church told them it would not marry couples with an age gap of more than 15 years, which seems a bit of a ludicrous policy.
But Milojko doesn't seem arsed, as his love for her is such that if needed, he 'would drink Viagra and go happy to paradise'.
Now if you'll excuse me, I'm off for a shower.
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