What course quick ejaculation?

This may help: Put a dab of a topical anesthetic on your glans. Use a condom to reduce sensation slghtly. A selective serotonin reuptake inhibitor (your physician can offer these if appropriate -- they're not risk-free) at a low dose will slow things down. Best is learning the squeeze technique your partner, which will help you with timing and bring both of you to new levels of enjoyment and mutual help.