Be careful when choosing one, especially if it is the synthetic product. When your orgasm starts, heart rate, blood pressure and respiration all increase exponentially. Or better yet, talk to your physician for advice on what may be best for you. If you are a bit overweight and have extra body fat, this is usually something that can be alleviated with diet and exercise.
This will help to keep the blood circulating through you for a long time. You should also consider removing high fat foods, dressings, alcohol, soft drinks, sauces and sugary snacks from your diet. You will not only get advice, but also make some good friends there.