Is it permissible for a man to preform Wudhu instead of Ghusl in the case of sperm discharge either through masturbation or sex if preforming Ghusl over and over again difficult and can prompt suspicion.
2 Answers
Ghusl (bath) is required after ejaculation to attain the ritual purity required for Salah (prayers). There is no excuse for avoiding it except the shortage of water or an illness which would be worsened by use of water ... in which case Tayammum (dry ablution) is permitted.
Quran 4:43 O you who have believed, do not approach prayer while ... in a state of janabah, ... until you have washed (تَغْتَسِلُوا) [your whole body]. And if you are ill or on a journey or one of you comes from the place of relieving himself or you have contacted women and find no water, then seek clean earth and wipe over your faces and your hands [with it]. ...
Ghusl (washing whole body) is obligatory not only after ejaculation but even without ejaculation if penis inserted in woman vagina once it becomes obligatory.
If case of shortage of water you can have Tayamum (dry ablution).