Could people please tell me why so many find it acceptable to jump into bed with a man on their first date these days
I could equally ask why you think it's not? There's no inherent requirement to know or have a deep emotional attachement with someone before you have sex: i.e. it's physically possible regardless of how long you've known each other. So the choice to wait or not is purely based on a person's own individual wishes. Some people may not see the point in waiting.
Or why sex seems to be so cheap now?
What an interesting phrasing. What 'price' do you think should be paid? Should one or both people be 'earning' it? This is fascinating and I'd genuinely be interested to hear what you mean.
From reading posts on here, It seems to me that it is considered quite OK to have a 'friend with benefits'
Yeah. Some people like having sex but don't necessarily want a relationship. I've had FWBs where we got on great as people and had brilliant chemistry in bed but weren't in a position where we wanted anything more than that.
Don't people want to get to know a prospective sexual partner and develop a relationship with them before indulging in sex any more?
Again with the telling wording. 'Indulging' - it's not an indulgence to do something fun.
It all seems a bit sad and soulless to me!
If you find the idea of having orgasms sad and soulless I don't know how to help you! Sex to me is just an activity that feels good that I can do with my body, like going for a run or doing yoga. Sometimes it's as much about the emotional connection but sometimes it's just about having a good time: also, the power of good sexual chemistry is pretty strong in itself, it doesn't need to be romantic. I don't know why I would deny myself something I enjoy?