Hi, Welcome to HealthcareMagic Forum.
is absolutely Harmless and it wont have any adverse effect on your Future sexual Life. You will be able to Father a child, Kindly don't worry. Do it only when you are sexually aroused may be twice or thrice a week. Give yourself some rest. Exercise regularly for an hour most days of the week and eat healthy nutritious balanced diet which should include fresh fruits and Green leafy vegetables. The advantage of this is it will prevent nightfalls.
Good Luck, Take Care.