Getting Bored too easily

Alright, Ive come to a point where im talking to like 5 or 6 girls all between 7-8 and I have come to realize that im getting bored of them too easily and long before I f-close.
Now Im not sure if this is on my end or theirs, I mean im usually pretty busy with work and school and the gym, so I have to plan my dates carefully, but I am not sure what to do to excite myself about these girls.
I mean ive made out with/fooled around with them all, so the next logical step is sex, but just simply laying a guarantee doesnt really do anything for me.
Do I move on and keep trying to find something stimulating or just appriciate the work ive put into them, slam em and move on?