how many calories are in a load of semen?

according to webmd, 85 for sex which i assume would be approx for the bj effort of which the calorie content of an ejaculation being 5-7 calories and going with 7 to be conservative, 85 calories - 7 calories = 78 net loss of calories

http://www.webmd.com/content/pages/6/1671_52001.htm

Fat/Calorie Burning Chart
The most important thing to remember about your weight is the relationship between calorie intake (from eating) and calorie burn (from activity). To lose weight, you need to burn more calories than you're taking in. To maintain your weight, intake and burn should be equal.

You need to burn off 3,500 calories to lose one pound of fat. That means if you walk four times a week for 30 minutes each, you'll lose a pound of fat in less than six weeks. Add that walking to a diet that cuts 500 calories a day from what you've been eating and you'll lose about seven pounds in six weeks.

Check the chart below to see how many calories your favorite aerobic activities burn off in just one 30-minute session:

Fat / Calorie Burn Chart

activity calories burned
Aerobic (low impact) 192
Ballroom dancing 96
Cleaning 114
Hiking 214
In-line skating 192
Line dancing 312
Running (9-minute mile) 360
Sex 85
Skiing (cross-country) 222
Skiing (downhill) 183
Stair-stepping 206
Step class (depends on step height) 200-300
Swimming (slow crawl) 237
Tennis 204
Walking (20-minute mile) 150
Yoga 100