It's the same as an equalizer in music players. You can set the parameters of how you view love and then see how it outputs. There is no right or wrong way to do it, but there definitely are settings that are terrible, some universally good, and then there's the gray area in which some like it and some don't.
Romance could include random gifts of affection, a material item, or taking a day off from work to **** him/her silly all day long.
The most common equation for male-to-female romance is Women=Time x Money, with the other equation for female-to-male being Men=Sex x Food.
There are many equations that depend on variables that can be defined on a case-by-case basis.
For example, for me and Wuffie, Romance= 2((Affection + conversation) + (Sweet talk + "Action stars"), where the highest value for Romance is 10,000, and the lowest is 9,001. Yes, our love is over 9,000 *****!
And yes, that's Algebra.
I have no idea what romance is.
(Time you have to give / Result you get) = Romance
I hate referring to "romance" as dinner with candles followed by a hot batch with flowers...