1. What is the difference between seeing and going out with someone?
seeing someone is just casual dates whereas going out is boy/girlfriend...but i hate the term 'going out'
2. If there is a difference; how long after beginning to see someone (if not asked to go out) is it before one should assume they are now in a relationship?
It depends, i mean my boyfriend now and I never had a 'will you go out with me?' we both kinda hung around alot and eventually at a party we kinda admitted how we felt about each other.
3. At what point is a relationship serious? (How long)
err well if you're in a relationship then i would say it was serious, in my mind if you dont see the relationship as serious you shouldnt be in one, just stick to casual dates.
4. How long into a relationship should one wait before having sex/ any form of sexual activity? (I know of people who have limits like 2 weeks for kissing, 1 month for hands etc. Strange people )
It really depends on how you feel, i mean there are people eho have limits like that, but it depends on how you feel and if the time is right. you cant plan for how long it is till it happens(or how short)
But really im not sure why you're asking, it is not what others say/do that matters, all that matters are the feelings of you and your partner.