original poster...Im sorry but we can not tell you whether you are weird or not, only you and your treatment providers can say whether how you think and talk about sexual issues of others is weird or a mental disorder....

what I can tell you is that there are many mental disorders where focusing on sexual issues of others is part of that mental disorder...for example those with PTSD can have thoughts that focus on others sexuality especially if the person doing the thinking and talking about others sexuality has been sexually abused in some way... this symptom is called by many things ....hypersexuality, hyperaroused, hyper vigilent, sexual addiction, and in some locations it can also fall under crimes if the discussions are taking place with people who feel they are in a situation where they can not say no lets not talk about this, or with children or other special needs persons.

it can also fall under borderline personality disorder that includes the person having rocky relationships therefore they are interested/focused on the sexual needs of others....

it can also fall under OCD depending upon how often a person thinks /wonders\ and discusses other peoples sex lives.....

my point is it can be a problem for many people and be a part of many different mental disorders. To find out your answer of whether you are weird or whether this is a mental problem in you, you will need to contact your (or a)treatment provider in your location.