Every body in the universe attracts every other body towards itself with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.Translated roughly, it means that the force with which any object pulls other objects towards itself depend on its weight - and on the weight of the object it is trying to pull. The heavier the two are, the more will be pull between them.
(It also depends on how far the two are, but lets hold that constant for now. For a given distance the only other factor is the weight)
So, for instance, the earth is huge - and is therefore able to pull us all towards itself - that's what we call gravity.
Taking a little poetic license, this should mean that heavier people should be more attractive - since their greater weight lets them attract others towards them with greater force.
PS: This is supposed to be funny, no offense intended to people of any weight.