.It may be due to
1.Anxiety, depression
2.Fatigue, stress
3.Relationship issues, performance anxiety,
4.consumption of alcohol, tobacco etc
5You can take the following measures
a) Avoid stress, anxiety, depression
b) Avoid alcohol and tobacco consumption
c) Go for regular exercise
d) lead a healthy living style
e) Practice relaxation Technique by deep breathing exercise (take deep full breath for 5 seconds, hold it for 3 seconds, exhale slowly for 5 seconds). Do it for 5 minutes without breaking the rhythm. It controls arousals and tension that lead to early ejaculation.
F) )Use Condom to reduce sensation
g) Take Foods to increase testosterone like eggs /asparagus/dark chocolate/carrots/oats/Ashwagandha/Avocado/blue berries/ banana/walnut/cereals/onion/garlic/almonds/bean/ mushroom h) Consult sex therapist/sexologist for advice.