I lift 4-5 days a week, eat clean and healthy, and look good naked. I've been like this for 8+ years. I'm currently 28, and I haven't done any cardio for years. Lately for the past year I feel like I don't have much energy for round 2 of sex.

Is running twice a week enough? I'm thinking of doing one sprint workout(8x200m) and one 20 minute sustained run.