Sex is like pizza.
When it's good, it's great, and even when it's bad, it's still pretty good... assuming it's made by someone who actually knows what they're doing. Pizza made by someone who doesn't know what they're doing, though, can result in food poisoning or lacerations or having your house burned down.
You can have pizza by yourself, but it's better when it's shared with at least one other person, as long as that person isn't too selfish.
Plain pizza is perfectly fine, but there are lots of different toppings you can add to make it even better - as long as you discuss them with everyone and come to an agreement beforehand.
A few people have weird dietary restrictions for medical reasons and can't have most pizza at all, but can usually be accomodated if you don't mind paying a bunch extra for pizza that tastes kinda weird and unnatural.
Most people will get hungry for pizza eventually, but some people are temporarily or permanently not interested and that is okay and trying to force pizza down their throat isn't generous, it's just weird and gross and nasty. Some people who want pizza just want a slice or two, others will eat as much as their bodies can physically withstand, if you let'em.
The main difference between sex and pizza is that successfully crafting a pizza is an Int check - in a skill that Jamie is optimized for - and successfully having sex is Charisma (or, depending on who you ask, Wisdom).