NOOOOO it is highly contagious!!! Consult a doctor to find out how long between symptoms you must wait before even thinking about it.
Once someone catches it they have it for life so don't inflict that on anyone. Treatment involves using an anti-viral cream/tablets until all the sore are gone, it's not normally expensive. You need to treat it everytime it flares up and don't touch the sores if possible. Keep your hands clean or it will spread!
Don't kiss, share a drink/towel/anything with someone if you have a cold sore. I literally mean you have a separate plate/cup/cutlery until it's cleared.
EDIT: If you dated someone else with Herpes you'd just cause flair up's in each other if you did have sex while the virus was active. The medical bills would soon add up. Once infected that's as bad as it gets so you can't make it 'worse' but if you have sores you'd still need to be careful not to spread it to each other